And the explanation of the evidence that the muezzin will turn only with his mouth, not with his whole body, and turning with the mouth is possible by turning the face.

Sayyiduna Abu Juhaifah (may Allah be pleased with him) narrates that I saw Sayyiduna Bilal (may Allah be pleased with him) giving the adhan, and he was turning his mouth (to the right and left). Sufyan described its manner and said that he was turning his head to the right and left. Sayyiduna Abu Juhaifah (may Allah be pleased with him) narrates that I presented myself before the Prophet (peace and blessings be upon him) at the place of Batha while he (peace and blessings be upon him) was sitting in a red tent and there were only a few people with him. Then Sayyiduna Bilal (may Allah be pleased with him) came and gave the adhan, then while saying «‏‏‏‏حَيَّ عَلَى الصَّلَاةِ، حَيَّ عَلَى الْفَلَاحِ» ‏‏‏‏, he turned his face to the right and left. In this narration, Thawri says that while saying «‏‏‏‏حَيَّ عَلَى الْفَلَاحِ» ‏‏‏‏ in his adhan, he turned his head to the right and left.