Women may enter the mosque only under two conditions:

They must go out neither perfumed nor conspicuously adorned, for the Prophet ﷺ said, “When any one of you women attends the mosque—in another wording: attends the night prayer—let her not apply fragrance.”
• This ḥadith is narrated by Zaynab al-Thaqafiyyah, the wife of ʿAbd Allāh b. Masʿūd, and is recorded by Muslim, al-Nasāʾī, Abū ʿAwānah, and Aḥmad.
• The second wording comes in Aḥmad through the route of Muḥammad b. ʿAjlān, who said: “Bukayr b. ʿAbd Allāh b. al-Ashajj related to me from Busr b. Saʿīd, from her.” This chain is sound (ḥasan).
• Muḥammad b. ʿAbd Allāh b. ʿAmr b. Hishām corroborated it from Bakr with the same wording; Aḥmad, al-Ṭayālisī, and likewise al-Nasāʾī transmit it, while al-Layth b. Saʿd supports it there with the first wording.
• Muslim also records it through Mukhramah, from his father, from Busr b. Saʿīd. Further supporting narrations from Abū Hurayrah and others will follow.

They must first seek their husbands’ permission, and the husbands are obliged to grant it, because the Prophet ﷺ said, “Do not bar your womenfolk from the mosques [at night] when they ask your leave to go, [but let them go out plain and unadorned]; [their homes, however, are better for them].”