In Fath al-Bari (1/477), it states:
“Al-Muhibb al-Tabari said: Some scholars regarded forming rows between the columns as disliked because of the prohibition reported concerning it. This dislike applies when there is no crowding. Its underlying reason is either that it breaks up the row or that it is a place where shoes are kept.” End quote. Al-Qurtubi said: “One report concerning the reason for its being disliked states that it is a place of prayer for the believing jinn.”
I say: A long pulpit with many steps carries the same ruling as a column, for it divides the first row and sometimes the second as well. Al-Ghazali said in Ihya’ (2/139):
“The pulpit divides some of the rows. The first row is only the single, uninterrupted row in the open space before the pulpit; the parts on either side of it are cut off. Al-Thawri used to say: The first row is the one extending before the pulpit. This is sound, because it is uninterrupted, and because the person sitting in it faces the preacher and hears him.”
I say: The pulpit divides the row only when it differs from the pulpit of the Prophet, may Allah bless him and grant him peace, for his had three steps. A pulpit like it does not divide the row, because the imam stands beside its lowest step. Thus, one of the ill consequences of departing from the sunnah in the design of the pulpit is falling under the prohibition mentioned in this hadith.
Similarly, heaters placed in some mosques in a manner that results in dividing the row also divide it—without the mosque’s imam or any of those praying there noticing this objectionable matter. This is due, first, to people’s remoteness from gaining a proper understanding of the religion and, second, to their indifference toward keeping away from what the Lawgiver has prohibited and deemed disliked.
It should be known that everyone who seeks to install a long pulpit that divides the rows, or places a heater that divides the row, should fear that he will receive an ample share of the words of the Prophet, may Allah bless him and grant him peace:
“... Whoever divides a row, Allah will cut him off.”
It was recorded by Abu Dawud with an authentic chain, as I demonstrated in Sahih Abi Dawud (no. 672).