(a) It is narrated from Ata' bin Abi Rabah that he asked the Mother of the Believers Sayyidah Aishah (may Allah be pleased with her): Have women been given a concession to pray on riding animals? She said: Women have not been given permission, neither in any hardship nor in normal circumstances.
(b) Muhammad said: This concerns the obligatory prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2222