Sunan an Nasai
1084
Sahih Isnaad+2

It was narrated that Abu Bushr said:"I heard Yusuf-meaning Ibn Mahak- narrating that Hakim said: 'I gave my pledge of allegiance to the Messenger of Allah (ﷺ), pledging that I would go down (in prostration) only after standing up from bowing

Sahih IsnaadAbu Ghuddah
Sahih IsnaadAl-Albani