[Machine] I saw the Messenger of Allah ﷺ perform the takbir by lifting his thumbs closely to his ears, then he bowed until every joint settled in its place. He raised his head until every joint settled in its place, then he went down in the takbir until his hands were level with his knees. This was narrated to us by Umar ibn Al-Khattab and Abdullah ibn Mas'ud regarding the placement of the knees before the hands. And Allah knows best.  

رَأَيْتُ رَسُولَ اللهِ ﷺ كَبَّرَ فَحَاذَى بِإِبْهَامَيْهِ أُذُنَيْهِ ثُمَّ رَكَعَ حَتَّى اسْتَقَرَّ كُلُّ مَفْصِلٍ مِنْهُ فِي مَوْضِعِهِ وَرَفَعَ رَأْسَهُ حَتَّى اسْتَقَرَّ كُلُّ مَفْصِلٍ مِنْهُ فِي مَوْضِعِهِ ثُمَّ انْحَطَّ بِالتَّكْبِيرِ حَتَّى سَبَقَتْ رُكْبَتَاهُ يَدَيْهِ تَفَرَّدَ بِهِ الْعَلَاءُ بْنُ إِسْمَاعِيلَ وَاللهُ تَعَالَى أَعْلَمُ وَرُوِّينَا عَنْ عُمَرَ بْنِ الْخَطَّابِ وَعَبْدِ اللهِ بْنِ مَسْعُودٍ فِي وَضْعِ الرُّكْبَتَيْنِ قَبْلَ الْيَدَيْنِ مِنْ فِعْلِهِمَا