It was narrated from Al'Irbad bin Sariyah that the Messenger of Allah ﷺ used to send Salah on the first row three times and on the second row once.  

عَنْ رَسُولِ اللَّهِ ﷺ كَانَ يُصَلِّي عَلَى الصَّفِّ الأَوَّلِ ثَلاَثًا وَعَلَى الثَّانِي وَاحِدَةً