Ibn 'Abbas (May Allah be pleased with them) reported:
The Messenger of Allah (ﷺ) said: "Glorify your Lord in Ruku' (bowing posture) and exert yourself in supplication in prostration. Thus your supplications are liable to be accepted."[Muslim].
App reference: Book 16, Hadith 20
Arabic/English book reference: Book 16, Hadith 1427