Bulugh al-Maram 2 The Book of Prayer كتاب الصلاة 320

وَعَنْ أَبِي بَكْرَةَ – رضى الله عنه – أَنَّهُ اِنْتَهَى إِلَى اَلنَّبِيِّ – صلى الله عليه وسلم -وَهُوَ رَاكِعٌ, فَرَكَعَ قَبْلَ أَنْ يَصِلَ إِلَى اَلصَّفِّ, فَقَالَ لَهُ اَلنَّبِيُّ – صلى الله عليه وسلم -{ زَادَكَ اَللَّهُ حِرْصًا وَلَا تَعُدْ } رَوَاهُ اَلْبُخَارِيُّ . 1 . 1 – صحيح. رواه البخاري (783).

Narrated Abu Bakrah (RA): He reached the Prophet (صلى الله عليه وسلم) while he was bowing, so he (Abu Bakrah) bowed before reaching the row. He mentioned that to the Prophet (صلى الله عليه وسلم) and the Prophet (صلى الله عليه وسلم) said to him, “May Allah increase your eagerness! But do not repeat.” [Reported by al-Bukhari].