It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: By Him in Whose hand is my soul, I see behind me just as I see in front of me. Therefore, keep your rows straight and perform your bowing and prostration well.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10565