The ruling on verbalizing the intention in acts of worship and clarifying its location

He also asks, and the brother Hashim Majd al-Din asks: Is the intention in acts of worship, such as prayer or others, to be spoken by saying, "I intend to pray four rak'ahs of Dhuhr," meaning to vocalize it, or is its location only the heart?
Answer: The Sunnah regarding the intention is that it is in the heart; this is the Sunnah. Vocalizing it is a religious innovation with no basis. The Prophet (peace and blessings be upon him) did not vocalize it, nor did his Companions (may Allah be pleased with them) , nor did the well-known imams among the scholars. However, one intends with his heart and knows in his heart that he will perform ablution, pray, fast, or perform Hajj. This is sufficient instead of saying, "I intend to pray such and such..." The heart is sufficient, and praise be to Allah. Except for Hajj, where one vocalizes the type of pilgrimage. One does not say, "I intend such and such," but rather says, "Labbaik (I am at your service) for Hajj, Labbaik for 'Umrah," as the Prophet (peace and blessings be upon him) and his Companions did. Yes.
The presenter: May Allah reward you.