مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4019
Musnad of Abdullah bin Mas'ood
It was narrated that al-Aswas said: ‘Alqamah and I entered upon ‘Abdullah bin Mas’ood and he said: When one of you bows, let him put his forearms on his thighs. It is as if I can see the interlaced fingers of the Messenger of Allah (ﷺ) in prayer.
Musnad Ahmad 4045Its isnad is saheeh, Muslim (534)]