Q: It is narrated by Anas that The Prophet (peace be upon him) used to face us before saying Takbir and say: Set your lines straight and be mild to one another! (Related by Al-Bukhari and Muslim). Both Al-Bukhari and Muslim also reported that the Prophet (peace be upon him) said, Straighten your rows, for straightening the row is a part of the perfection of the Prayer. Furthermore, Al-Nu`man ibn Bashir narrated, The Prophet (peace be upon him) used to straighten the rows as one would set an arrow upright until he thought that we got and understood his act. One day, he turned his face to us when he saw a man whose chest was protruding out from the row. Thereupon, he said: Straighten your rows or Allah would create dissension amongst you. Related by the Five Compilers of Hadith (Imams Ahmad, Abu Dawud, Al-Tirmidhy, Al-Nasa'y and Ibn Majah). See, Fiqh Al-Sunnah, p. 215.Please, explain these Hadiths so that we can explain them to the Ma'mums (the persons led by an Imam in Prayer). May Allah reward you!