the alif would have been omitted because of the jussive form. This negative formulation may indicate either dislike or prohibition, and the issue is one over which there is disagreement. The well-known position of the madhhab is that stepping over people’s necks is disliked.
The correct view, however, is that stepping over people’s necks is prohibited, whether during the sermon or otherwise. This is based on the Prophet’s saying, peace and blessings be upon him, to a man whom he saw stepping over people’s necks: “Sit down, for you have caused harm.” (1) This is especially so when it occurs during the sermon, since it harms people and distracts them from listening to the sermon: it distracts the person whose neck is stepped over, as well as those who see and watch him. Thus, the harm it causes is widespread.
EXCEPT IF HE IS AN IMAM, OR IF IT IS TO REACH A GAP …
His statement, “Except if he is an imam”: that is, if he is the imam, there is nothing wrong with his stepping over people, because his place is at the front. This is conditional, however, upon there being no way for him to reach his place except by stepping over them. If he can reach his place without doing so—for example, if there is a door at the front of the mosque through which the imam may enter—then he is like everyone else with regard to stepping over people, because the effective cause is the same.
Nowadays, praise be to Allah, people have become accustomed to providing a door for the imam at the front of the mosque, so that he may enter through it. In earlier times, when houses adjoined the qiblah-side of the mosques, the imam would enter through the rear door and step over people’s necks. Yet people did not consider this objectionable, because he was their imam and they did not feel harmed by it.
His statement, “Or if it is to reach a gap”: that is, an open space in the front rows. If there is a gap, then there is nothing wrong with stepping over people to reach it.