Not doing that between the two prostrations
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، عَنْ سُفْيَانَ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا افْتَتَحَ الصَّلاَةَ كَبَّرَ وَرَفَعَ يَدَيْهِ وَإِذَا رَكَعَ وَبَعْدَ الرُّكُوعِ وَلاَ يَرْفَعُ بَيْنَ السَّجْدَتَيْنِ .
It was narrated from Salim that his father said: "When the Prophet (ﷺ) started to pray he said the takbir and raised his hands, and when he bowed, and after bowing, but he did not raise them between the two prostrations."