Sahih Muslim
The Book of Mosques and Places of Prayer — Hadith #1099
Scholarly Consensus: Sahih How we grade
حَدَّثَنِي الْحَكَمُ بْنُ مُوسَى، حَدَّثَنَا عِيسَى بْنُ يُونُسَ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ أَبِي خَالِدٍ، عَنِ الزُّبَيْرِ بْنِ عَدِيٍّ، عَنِ مُصْعَبِ بْنِ سَعْدِ بْنِ أَبِي وَقَّاصٍ، قَالَ صَلَّيْتُ إِلَى جَنْبِ أَبِي فَلَمَّا رَكَعْتُ شَبَّكْتُ أَصَابِعِي وَجَعَلْتُهُمَا بَيْنَ رُكْبَتَىَّ فَضَرَبَ يَدَىَّ فَلَمَّا صَلَّى قَالَ قَدْ كُنَّا نَفْعَلُ هَذَا ثُمَّ أُمِرْنَا أَنْ نَرْفَعَ إِلَى الرُّكَبِ .
I said prayer by the side of my father. When I bowed I intertwined my fingers and placed them between my knees. He struck my hands. When he completed the prayer he said: We used to do that but then were commanded to lift (our palms) to the knees.
Chain of Narration (Isnad)
Hadith Grading
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Scholarly Consensus: Sahih