Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "A slave becomes nearest to his Rubb when he is in prostration. So increase supplications in prostrations."[Muslim]. (FR)
App reference (FR): Book 17, Hadith 34 (FR)
Arabic/English book reference (FR): Book 17, Hadith 1498 (FR)