It has been reported on the authority of Anas b. Malik who said:

The Messenger of Allah (ﷺ) sent Busaisah as a scout to see what the caravan of Abu Sufyan was doing. He came (back and met the Prophet (ﷺ) in his house) where there was nobody except myself and the Messenger of Allah. I do not remember whether he (Hadrat Anas) made an exception of some wives of the Prophet (ﷺ) or not and told him the news of the caravan. (Having heard the news), the Messenger of Allah (ﷺ) came out (hurriedly), spoke to the people and said: We are in need (of men) ; whoever has an animal to ride upon ready with him should ride with us. People began to ask him permission for bringing their riding animals which were grazing on the hillocks near Medina. He said: No. (I want) only those who have their riding animals ready. So the Messenger of Allah (ﷺ) and his Companions proceeded towards Badr and reached there forestalling the polytheists (of Mecca). When the polytheists (also) reached there, the Messenger of Allah (ﷺ) said: None of you should step forward to (do) anything unless I am ahead of him. The polytheists (now) advanced (towards us), and the Messenger of Allah (ﷺ) said. Get up to enter Paradise which is equal in width to the heavens and the earth. 'Umair b. al- Humam al-Ansari said: Messenger of Allah, is Paradise equal in extent to the heavens and the earth? He said: Yes. 'Umair said: My goodness! The Messenger of Allah (ﷺ) asked him: What prompted you to utter these words (i. e. my goodness! ')? He said: Messenger of Allah, nothing but the desire that I be among its residents. He said: You are (surely) amona its residents. He took out dates from his bag and began to eat them. Then he said: If I were to live until I have eaten all these dates of mine, it would be a long life. (The narrator said): He threw away all the dates he had with him. Then he fought the enemies until he was killed.

حَدَّثَنَا أَبُو بَكْرِ بْنُ النَّضْرِ بْنِ أَبِي النَّضْرِ، وَهَارُونُ بْنُ عَبْدِ اللَّهِ، وَمُحَمَّدُ بْنُ رَافِعٍ، وَعَبْدُ بْنُ حُمَيْدٍ - وَأَلْفَاظُهُمْ مُتَقَارِبَةٌ - قَالُوا حَدَّثَنَا هَاشِمُ بْنُ الْقَاسِمِ، حَدَّثَنَا سُلَيْمَانُ، - وَهُوَ ابْنُ الْمُغِيرَةِ - عَنْ ثَابِتٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ بَعَثَ رَسُولُ اللَّهِ صلى الله عليه وسلم بُسَيْسَةَ عَيْنًا يَنْظُرُ مَا صَنَعَتْ عِيرُ أَبِي سُفْيَانَ فَجَاءَ وَمَا فِي الْبَيْتِ أَحَدٌ غَيْرِي وَغَيْرُ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ لاَ أَدْرِي مَا اسْتَثْنَى بَعْضَ نِسَائِهِ قَالَ فَحَدَّثَهُ الْحَدِيثَ قَالَ فَخَرَجَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَتَكَلَّمَ فَقَالَ ‏"‏ إِنَّ لَنَا طَلِبَةً فَمَنْ كَانَ ظَهْرُهُ حَاضِرًا فَلْيَرْكَبْ مَعَنَا ‏"‏ ‏.‏ فَجَعَلَ رِجَالٌ يَسْتَأْذِنُونَهُ فِي ظُهْرَانِهِمْ فِي عُلْوِ الْمَدِينَةِ فَقَالَ ‏"‏ لاَ إِلاَّ مَنْ كَانَ ظَهْرُهُ حَاضِرًا ‏"‏ ‏.‏ فَانْطَلَقَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَأَصْحَابُهُ حَتَّى سَبَقُوا الْمُشْرِكِينَ إِلَى بَدْرٍ وَجَاءَ الْمُشْرِكُونَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لاَ يُقَدِّمَنَّ أَحَدٌ مِنْكُمْ إِلَى شَىْءٍ حَتَّى أَكُونَ أَنَا دُونَهُ ‏"‏ ‏.‏ فَدَنَا الْمُشْرِكُونَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ قُومُوا إِلَى جَنَّةٍ عَرْضُهَا السَّمَوَاتُ وَالأَرْضُ ‏"‏ ‏.‏ قَالَ يَقُولُ عُمَيْرُ بْنُ الْحُمَامِ الأَنْصَارِيُّ يَا رَسُولَ اللَّهِ جَنَّةٌ عَرْضُهَا السَّمَوَاتُ وَالأَرْضُ قَالَ ‏"‏ نَعَمْ ‏"‏ ‏.‏ قَالَ بَخٍ بَخٍ ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَا يَحْمِلُكَ عَلَى قَوْلِكَ بَخٍ بَخٍ ‏"‏ ‏.‏ قَالَ لاَ وَاللَّهِ يَا رَسُولَ اللَّهِ إِلاَّ رَجَاءَةَ أَنْ أَكُونَ مِنْ أَهْلِهَا ‏.‏ قَالَ ‏"‏ فَإِنَّكَ مِنْ أَهْلِهَا ‏"‏ ‏.‏ فَأَخْرَجَ تَمَرَاتٍ مِنْ قَرْنِهِ فَجَعَلَ يَأْكُلُ مِنْهُنَّ ثُمَّ قَالَ لَئِنْ أَنَا حَيِيتُ حَتَّى آكُلَ تَمَرَاتِي هَذِهِ إِنَّهَا لَحَيَاةٌ طَوِيلَةٌ - قَالَ - فَرَمَى بِمَا كَانَ مَعَهُ مِنَ التَّمْرِ ‏.‏ ثُمَّ قَاتَلَهُمْ حَتَّى قُتِلَ ‏.‏