Hadith.1142 - Imam (as) said:
"Complete your rows when you see a gap, and it does not harm you to move back if you find tightness in the first row to the row behind you, walking at an angle."
Man Lā Yaḥḍuruh al-Faqīh #1135Hadith.1140 - Abu Al-Hasan Imam Musa ibn Jafar Al-Kadhim (as) said:
"Praying in the first row is like striving (jihad) in the way of Allah...