Al-Hasan (may Allah have mercy on him) narrates from Sayyiduna Abu Bakrah (may Allah be pleased with him) that he entered the mosque while the Prophet (peace and blessings be upon him) was bowing. He bowed before reaching the row. the Prophet (peace and blessings be upon him) said: "May Allah increase your eagerness, but do not do this again."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5216