The recommendation to place the hands on the knees when bowing, and the abrogation of tatbiq
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 .
Mus'ab b. Sa'd b. Abu Waqqas reported: 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.