Narrated 'Abdullah bin Zaid bin Abd-Rabbihi (RA):

A man appeared to me while I was asleep and told me to say, "Allahu Akbar, Allahu Akbar (Allah is the Most Great, Allah is the Most Great)" and he mentioned the Adhan with Allahu Akbar four times without Tarji', and the Iqama once except Qad qamat-is-Salah (the prayer stood ready to begin), (he repeated it twice). He ('Abdullah) said when it was morning I went to Allah's Messenger (ﷺ) and he said, "It is a true vision..." [Reported by Ahmad and Abu Dawud; at-Tirmidni and Ibn Khuzaimah graded it Sahih (authentic)].

عَنْ عَبْدِ اَللَّهِ بْنِ زَيْدِ بْنِ عَبْدِ رَبِّهِ ‏- رضى الله عنه ‏- قَالَ: { طَافَ بِي ‏-وَأَنَا نَائِمٌ‏- رَجُلٌ فَقَالَ: تَقُولُ: "اَللَّهُ أَكْبَرَ اَللَّهِ أَكْبَرُ, فَذَكَرَ اَلْآذَانَ ‏- بِتَرْبِيع اَلتَّكْبِيرِ بِغَيْرِ تَرْجِيعٍ, وَالْإِقَامَةَ فُرَادَى, إِلَّا قَدْ قَامَتِ اَلصَّلَاةُ ‏- قَالَ: فَلَمَّا أَصْبَحْتُ أَتَيْتُ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-فَقَالَ: "إِنَّهَا لَرُؤْيَا حَقٍّ.‏.‏.‏" } اَلْحَدِيثَ.‏ أَخْرَجَهُ أَحْمَدُ, وَأَبُو دَاوُدَ, وَصَحَّحَهُ اَلتِّرْمِذِيُّ, وَابْنُ خُزَيْمَةَ [1]‏ .‏