The permissibility of the talbiyah in Hajj or 'Umrah, and raising the voice with it for both men and women alike.

The talbiyah is a form of dhikr that differs from most other dhikr, because the default for most dhikr is to keep it quiet and not to raise the voice. As for the talbiyah in Hajj and 'Umrah, it is the opposite: one should raise his voice as much as he is able to do so. Our Prophet (peace be upon him) pointed to this when he was asked about the best of Hajj. He said: The best of Hajj is al-'ajj and al-thajj. Al-'ajj is raising the voice with the talbiyah, and al-thajj is slaughtering the hady and udhiyah. This is the best of Hajj. The Companions of the Prophet (peace and blessings be upon him) implemented this word, al-'ajj. Jabir (may Allah be pleased with him) narrated to us the story of the Prophet's (peace and blessings be upon him) Hajj: "We did not reach al-Rawhah until our voices were hoarse from raising them in the tahlil and takbir." Hoarseness of voice is not prescribed in any of the rites of Hajj other than the talbiyah. Therefore, it is obligatory to raise the voice and be bold with it. I say, correcting myself and others, that even women should accept what they have accepted regarding this matter, as this is the ruling of the Shari'ah. It is prescribed for women to raise their voices, but I observe that they should raise their voices in such a way that their voices blend with the voices of the men, so that they do not separate from the men; because otherwise, it becomes a second problem for us—(he laughs, may Allah have mercy on him).
Abu Layla : Sometimes women, sometimes men.

The Shaykh : Ah, no. And this reminds me of something people have become accustomed to, which has no basis: they form choirs, choirs of people, sometimes one group and sometimes another. No, the default is that every individual among those reciting the talbiyah recites it. If two or more voices meet, there is no harm. But to intentionally form a choir, meaning with one voice, this has no basis. What is the point, if I may say so, of making these people form a choir in Mina and at 'Arafah and these places? This is impossible. So, every person, according to his nature, temperament, and ability, if two voices meet, there is no obstacle. But do not strain yourselves to walk with your voice matching your neighbor's voice; rather, each person is for himself. It is not a problem for a Muslim that perhaps our Lord hears the intermingled voices and distinguishes the sincere from the one who shows off. This is, of course, no problem, because Allah (Mighty and Majestic) is All-Encompassing and All-Knowing. Therefore, the talbiyah must be with a raised voice, to the greatest extent a person is able.