If one says in his adhan, while forgetting: “Hasten to the prayer” only once, is his adhan valid, and does he repeat from the beginning of the adhan?

Question:
He says: Honorable Shaykh, may Allah grant you success. A man called the adhan, and when he reached “Hasten to the prayer,” he said it only once. Is his adhan valid if he was forgetting? And if it is not valid, does he repeat from the beginning of the adhan, or from “Hasten to the prayer”?

Answer:
If the time is still close, he performs what he left out and what follows it in the adhan. But if the time has passed, he repeats the adhan from the beginning. Yes.