Abu Bakrah said that he came to the mosque when the prophet ﷺ was bowing. So I bowed outside the row (before joining it). The prophet ﷺ said; May Allah increase your eagerness! But do not do it again.  

أَنَّهُ دَخَلَ الْمَسْجِدَ وَنَبِيُّ اللَّهِ ﷺ رَاكِعٌ قَالَ فَرَكَعْتُ دُونَ الصَّفِّ فَقَالَ النَّبِيُّ ﷺ زَادَكَ اللَّهُ حِرْصًا وَلاَ تَعُدْ  

Abu Bakrah came when the apostle of Allah ﷺ was bowing. So he bowed without the row (before joining it). He then went to the row. When the prophet ﷺ finished his prayer, he said: which of your bowed without the row, and then went to the row? Abu Bakrah said; it was i. the prophet ﷺ said: May Allah increase your eagerness ! but do not do it again.  

أَنَّ أَبَا بَكْرَةَ جَاءَ وَرَسُولُ اللَّهِ رَاكِعٌ فَرَكَعَ دُونَ الصَّفِّ ثُمَّ مَشَى إِلَى الصَّفِّ فَلَمَّا قَضَى النَّبِيُّ ﷺ صَلاَتَهُ قَالَ أَيُّكُمُ الَّذِي رَكَعَ دُونَ الصَّفِّ ثُمَّ مَشَى إِلَى الصَّفِّ فَقَالَ أَبُو بَكْرَةَ أَنَا فَقَالَ النَّبِيُّ ﷺ زَادَكَ اللَّهُ حِرْصًا وَلاَ تَعُدْ