Hadithcore
Sahih al-Bukhari, 774b
sahih

Anas said:

One of the Ansar used to lead the Ansar in Salat in the Quba' mosque and it was his habit to recite Qul Huwal-lahu Ahad whenever he wanted to recite something in Salat. When he finished that Surah, he would recite another one with it. He followed the same procedure in each Rak'a. His companions discussed this with him and said, "You recite this Surah and do not consider it sufficient and then you recite another. So would you recite it alone or leave it and recite some other." He said, "I will never leave it and if you want me to be your Imam on this condition then it is all right ; otherwise I will leave you." They knew that he was the best amongst them and they did not like someone else to lead them in Salat. When the Prophet (ﷺ) went to them as usual, they informed him about it. The Prophet (ﷺ) addressed him and said, "O so-and-so, what forbids you from doing what your companions ask you to do ? Why do you read this Surah particularly in every Rak'a ?" He repiled, "I love this Surah." The Prophet (ﷺ) said, "Your love for this Surah will make you enter Paradise."

وَقَالَ عُبَيْدُ اللَّهِ عَنْ ثَابِتٍ، عَنْ أَنَسٍ ـ رضى الله عنه ـ كَانَ رَجُلٌ مِنَ الأَنْصَارِ يَؤُمُّهُمْ فِي مَسْجِدِ قُبَاءٍ، وَكَانَ كُلَّمَا افْتَتَحَ سُورَةً يَقْرَأُ بِهَا لَهُمْ فِي الصَّلاَةِ مِمَّا يَقْرَأُ بِهِ افْتَتَحَ بِ ـ ‏{‏قُلْ هُوَ اللَّهُ أَحَدٌ‏}‏ حَتَّى يَفْرُغَ مِنْهَا، ثُمَّ يَقْرَأُ سُورَةً أُخْرَى مَعَهَا، وَكَانَ يَصْنَعُ ذَلِكَ فِي كُلِّ رَكْعَةٍ، فَكَلَّمَهُ أَصْحَابُهُ فَقَالُوا إِنَّكَ تَفْتَتِحُ بِهَذِهِ السُّورَةِ، ثُمَّ لاَ تَرَى أَنَّهَا تُجْزِئُكَ حَتَّى تَقْرَأَ بِأُخْرَى، فَإِمَّا أَنْ تَقْرَأَ بِهَا وَإِمَّا أَنْ تَدَعَهَا وَتَقْرَأَ بِأُخْرَى‏.‏ فَقَالَ مَا أَنَا بِتَارِكِهَا، إِنْ أَحْبَبْتُمْ أَنْ أَؤُمَّكُمْ بِذَلِكَ فَعَلْتُ، وَإِنْ كَرِهْتُمْ تَرَكْتُكُمْ‏.‏ وَكَانُوا يَرَوْنَ أَنَّهُ مِنْ أَفْضَلِهِمْ، وَكَرِهُوا أَنْ يَؤُمَّهُمْ غَيْرُهُ، فَلَمَّا أَتَاهُمُ النَّبِيُّ صلى الله عليه وسلم أَخْبَرُوهُ الْخَبَرَ فَقَالَ ‏"‏ يَا فُلاَنُ مَا يَمْنَعُكَ أَنْ تَفْعَلَ مَا يَأْمُرُكَ بِهِ أَصْحَابُكَ وَمَا يَحْمِلُكَ عَلَى لُزُومِ هَذِهِ السُّورَةِ فِي كُلِّ رَكْعَةٍ ‏"‏‏.‏ فَقَالَ إِنِّي أُحِبُّهَا‏.‏ فَقَالَ ‏"‏ حُبُّكَ إِيَّاهَا أَدْخَلَكَ الْجَنَّةَ ‏"‏‏.‏

References2 variants
In-Book Reference
Book 10, Hadith 169
USC-MSA web (English) reference
Vol. 1, Book 11, Hadith 741 (deprecated numbering scheme)
Sharh · explanationclick to expand
Surat al-Ikhlasis one of the greatest surahs in the Qur’an. Even though its words are few, it contains sublime and important meanings, as it clearly explains the concept of Tawhid (the oneness of Allah), the importance of worshipping Him alone and turning to Him alone, and it categorically states that He has no son and no father (may He be glorified and exalted). In this hadith, Anas ibn Malik (may Allah be pleased with him) narrates that a man of the Ansar – whose name was Kulthum ibn Hidm (may Allah be pleased with him) – used to lead his companions in prayer in the mosque of Quba’, which was the first mosque that the Prophet (blessings and peace of Allah be upon him) built in Madinah when he arrived in the city as a migrant. It stands at the entrance to Madinah for one who is coming from the direction of Makkah. Every time he wanted to recite a surah after al-Fatihah, he would recite before it {QulHuwa Allahu ahad (Say, “He is Allah, [who is] One…)} [al-Ikhlas], then he would recite another surah. His companions spoke to him and told him that this surah on its own was sufficient for reciting after al-Fatihah, and by reciting it you will have done what is required of you in terms of recitation, so either recite it on its own, or recite the other surah that youwant to recite after it. But the man refused to do that, and gave them the choice between letting him continue to lead them in prayer in this manner, or appointing someone else to lead the prayer, if they did not like him to lead them. When the Prophet (blessings and peace of Allah be upon him) came to them, they told him about what this man was doing – the Prophet (blessings and peace of Allah be upon him) used to come to the mosque of Quba’ every Saturday to pray there, as it says in al-Sahihayn – so the Prophet (blessings and peace of Allah be upon him) asked him about the reason why he did not agree to what his companions were asking of him, and why he persisted in reciting {QulHuwa Allahu ahad (Say, “He is Allah , [who is] One…)} [al-Ikhlas] with every other surah he recited. The man told the Messenger of Allah (blessings and peace of Allah be upon him) that his love for Surat al-Ikhlas was what made him do that. The Prophet (blessings and peace of Allah be upon him) approved of him doing that, and gave him the glad tidings that his love for this surah had gained him admittance to Paradise. It is well-known that admittance to Paradise will only happen in the hereafter, but as it is inevitably going to happen, it is as if it has already happened, so the Prophet (blessings and peace of Allah be upon him) spoke in the past tense when he gave him this good news. This hadith highlights the virtue of Surat al-Ikhlas. It also indicates that it is permissible to recite two surahs [besides al-Fatihah] in one rak‘ah..
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