Abdur Rahman bin Abi Laila says that when Sayyiduna Ali (may Allah be pleased with him) heard the muezzin giving the adhan, he would repeat the same words that the muezzin said, and after saying «اَشْهَدُ أَنَّ مُحَمَّدًا رَسُوْلُ اللّٰهِ» in response to «اَشْهَدُ أَنَّ مُحَمَّدًا رَسُوْلُ اللّٰهِ», he would also say that those who deny Muhammad (peace be upon him) are liars.