Mishkat al-Masabih #759
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي حُمَيْدٍ السَّاعِدِيِّ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا قَامَ إِلَى الصَّلَاةِ اسْتَقْبَلَ الْقِبْلَةَ وَرَفَعَ يَدَيْهِ وَقَالَ: الله أكبر. رَوَاهُ ابْن مَاجَه
Abu Humaid as-Sa‘idi said that when God’s Messenger stood up to pray, he faced the qibla, raised his hands and said, “God is most great."
Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #759 from Mishkat al-Masabih, in the Book of Prayer.