Is intention alone sufficient for entering the state of ihram?

Question:
He says: Honorable Shaykh, may Allah grant you success, is it sufficient for entering the state of ihram for 'Umrah or Hajj to merely intend it or to verbalize the intention, such as saying, "I intend 'Umrah," or is it necessary to recite the known talbiyah, "Labbaik Allahumma 'Umrah"?

Answer:
That is how it is. He says, "Labbaik Allahumma 'Umrah," or "Labbaik Allahumma Hajjan," mentioning the type of worship in the talbiyah. He does not say, "I intend" or "I want to enter ihram for this," he does not say that. Rather, when he recites the talbiyah, he mentions the type of worship he intends.