Hisham ibn Salim said: “One day when Ameer al-Momineen (a.s) went out along with his companions. He was riding his horse, but noticed that his companions were walking. He asked them if they had something to do with him. They replied in the negative and said that they just wanted to be with him. He then asked them to ride their horses, since accompanying one who is riding on foot will corrupt the one who is riding and humiliate those who are walking.” Hisham ibn Salim said that another time God's Prophet (a.s) left with them and they did the same thing. The Prophet (a.s) said to them: “Return since the sound of shoes stamping on the ground from behind will corrupt one’s heart if he is foolish.”