What is the ruling on verbalizing the intention?

Question : The questioner asks: Is it permissible to verbalize the intention for performing 'Umrah, or Hajj, or tawaf and sa'y around the Sacred House? And when is it permissible to verbalize it?

Answer : There is no report from the Prophet (peace and blessings be upon him) of him vocalizing his intention in any of his acts of worship (peace and blessings be upon him).
Even in Hajj and 'Umrah, the Prophet (peace and blessings be upon him) did not say, when he intended Hajj or 'Umrah, "O Allah, I intend such and such." That is not established from him, nor did he order any of his Companions to do it either. The most that is reported in this matter is that Dhabibah bint al-Zubayr (may Allah be pleased with her) complained to him that she intended to perform Hajj while she was ill, meaning sick. So the Prophet (peace and blessings be upon him) said to her: "Perform Hajj and stipulate that my place of completion is where I am detained, for you have upon your Lord what you have stipulated."
The reason the speech here was with the tongue is that the contract of Hajj is in the position of a vow, and a vow is made with the tongue, because if one vows in his heart, that is not a vow, and the vow is not established. So when Hajj is like a vow in the obligation to fulfill it upon beginning it, the Prophet (peace and blessings be upon him) ordered her to stipulate with her tongue, and to say: "If I am detained by a detainer, then my place of completion is where I am detained."
As for what is established by the hadith from the Messenger of Allah (peace and blessings be upon him) , that does not mean that he verbalizes the intention, but rather it means that he mentions his ritual in his talbiyah. Otherwise, the Prophet (peace and blessings be upon him) did not verbalize the intention,