What is the ruling on the mu'adhdhin forgetting to say "Prayer is better than sleep"?

Question : The questioner says: If the mu'adhdhin forgets to say "Prayer is better than sleep," what is required of him, with evidence?

Answer : If the mu'adhdhin forgets to say "Prayer is better than sleep," the well-known position among the scholars is that his adhan is valid, because saying "Prayer is better than sleep" in the Fajr adhan is a recommended practice (sunnah) and not obligatory. The evidence for this is that Jibril (peace be upon him)—indeed, 'Abdullah ibn Zayd (may Allah be pleased with him), when he saw the adhan in a dream—did not include the phrase "Prayer is better than sleep" in it. Therefore, saying it is not a condition. If a person says it in the Fajr adhan, which is after the appearance of dawn, it is better; and if he does not say it, there is no blame on him. Yes.