Mishkat al-Masabih #3288
Oaths and Vows
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا اجْتَهَدَ فِي الْيَمِينِ قَالَ: «لَا وَالَّذِي نفس أَبُو الْقَاسِم بِيَدِهِ» . رَوَاهُ أَبُو دَاوُد
Abu Sa'id al-Khudri told that when God’s Messenger swore strongly he said, “No, by Him in whose hand is the soul of Abu Qasim.”
Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #3288 from Mishkat al-Masabih, in the Book of Oaths and Vows.