If there is a gap in the front Saff, is it compulsory to fill the gap?

Answer

It is necessary/waajib to fill a gap in the saff in front of you during Salaat. The musalli – any one – alongside the gap should take a single step sideways to fill the gap. In other words, all the musallis in the saff will have to move to fill the gap. This is the best. However, if the musallis standing next to the gap are ignorant and refrain from filling the gap, then the musalli standing in the row behind directly in line with the gap should move forward to fill the space. If the gap is not right in front of you, and it will entail much walking to fill the gap, then you should not walk to the gap. The one who is in front of the gap is guilty of sinning for leaving the gap.