Daleel::-1) Narrated Anas bin Malik (RA) The Prophet (SAW), said,, “Straighten your rows for I see you from behind my back.” Anas (RA) added, “Everyone of us used to put his shoulder with the shoulder of his companion and his foot with the foot of his companion.”
[Saheeh Al-Bukhari Book of Adhan, Chapter: To standshoulder to shoulder and foot to foot in a row, باب إِلْزَاقِ الْمَنْكِبِ بِالْمَنْكِبِ وَالْقَدَمِ بِالْقَدَمِ فِي الصَّفِّ Hadeeth No.725]
2) Narated By Abdullah ibn Umar : The Prophet (pbuh) said: Set the rows in order, stand shoulder to shoulder, close the gaps, be pliant in the hands of your brethren, and do not leave openings for the devil. If anyone joins up a row, Allah will join him up, but if anyone breaks a row, Allah will cut him off.[Ref: Abu-Dawud Book 002, Hadith Number 0666]
3) It was narrated from ‘Abd-Allaah ibn ‘Umar that the Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Make your rows straight, stand shoulder to shoulder and close the gaps, and do not resist your brothers’ hands. Do not leave any gaps for the Shaytaan. Whoever complete a row, Allaah will reward him, and whoever breaks a row, Allaah will forsake him.
(Abu Dawood said: What is meant by “Do not resist your brothers’ hands” is that a man should be easy-going if his brother pushes him forwards or backwards to make the row straight. (‘Awn al-Ma’bood).
[Ref: Narrated by Abu Dawood, 666; al-Nasaa’i, 819. Classed as saheeh by al-Albaani in Saheeh Abi Dawood, 620.] ..