Abu Huraira reported God’s Messenger as saying, “The nearest a servant comes to his Lord is when he is prostrating himself, so make supplication often.” Muslim transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب الصلاة / 894
Hadith Gradingالألبانی:صَحِيحٌ | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه مسلم (215 / 482)»