It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A person is nearest to his Lord when he is in prostration, so supplicate abundantly in prostration."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2686