It was narrated from Abdul-Jabbar bin Wa'il, from his father, that:

He saw the Prophet (ﷺ), when he started to pray, raise his hands until his thumbs were almost level with his earlobes.

أَخْبَرَنَا مُحَمَّدُ بْنُ رَافِعٍ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، قَالَ حَدَّثَنَا فِطْرُ بْنُ خَلِيفَةَ، عَنْ عَبْدِ الْجَبَّارِ بْنِ وَائِلٍ، عَنْ أَبِيهِ، أَنَّهُ رَأَى النَّبِيَّ صلى الله عليه وسلم إِذَا افْتَتَحَ الصَّلاَةَ رَفَعَ يَدَيْهِ حَتَّى تَكَادَ إِبْهَامَاهُ تُحَاذِي شَحْمَةَ أُذُنَيْهِ ‏.‏