Sunan Abu Dawud
851
Sahih+3

Narrated Asma' daughter of AbuBakr: I heard the Messenger of Allah (ﷺ) say: One of you who believes in Allah and in the Last Day should not raise her head until the men raise their heads (after prostration) lest they should see the private parts of men

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid