The Sahabah (may Allah be pleased with them) and those who came after them, the Tabi‘in, were the keenest of people to follow the example of the Messenger of Allah (blessings and peace of Allah be upon him) and walk in his footsteps, and to adhere to that until death. The Tabi‘in used to ask the companions of the Prophet (blessings and peace of Allah be upon him) to teach them what they knew, and if they erred, the Sahabah (may Allah be pleased with them) would correct them. In this hadith, it is narrated that when Anas ibn Malik (may Allah be pleased with him) returned to Madinah from Basra, the people asked him: What do you find different that has changed since the time of the Messenger of Allah (blessings and peace of Allah be upon him)? This question reflects their great keenness to follow the Messenger of Allah (blessings and peace of Allah be upon him, and shows that they were very cautious in avoiding going against that. In this manner, they were striving to avoid going against the commands of the Prophet (blessings and peace of Allah be upon him). Anas (may Allah be pleased with him) replied that nothing had changed, except that they did not straighten their rows. This indicates that straightening the rows was something that was well-known at the time of the Prophet (blessings and peace of Allah be upon him) and that the people changed that after he was gone. The scholars have mentioned several reasons regarding the wisdom behind straightening the rows, including the following: that it leads to a good appearance and good performance of prayer, for being straight and proper is something that is required both outwardly and inwardly. Another reason is so that the Shaytan will not come in between their rows and spoil their prayer with his whispers. Yet another reason is that straightening the rows gives them more space so that they can all pray together even if their number is great; if they consolidate their rows, their mosque will be able to accommodate all of them, but if they do not do that, it will feel too crowded..