´It was narrated that An-Numan bin Bashir said:` "The Messenger of Allah (ﷺ) used to straighten the rows like shaft of an arrow is straightened before the head is attached to it. He saw a man whose chest was sticking out from the row. I saw the Messenger of Allah (ﷺ) say: 'Make your rows straight or Allah will cause your faces to be deformed."
Hadith Referenceسنن نسائي / كتاب الإمامة / 811
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:صحيح مسلم
´It was narrated that Al-Bara bin Azib said:` "The Messenger of Allah (ﷺ) used to go between the rows from one side to another, patting our shoulders and chests and saying: 'Do not make your rows ragged or your hearts will be filled with enmity toward one another.' And he used to say: 'Allah and His angels send Salah upon the front rows."'
Hadith Referenceسنن نسائي / كتاب الإمامة / 812
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح