Al-Kāfi

Hadith 1270
womenprostration
4ـ أَحْمَدُ بْنُ مُحَمَّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنِ ابْنِ مُسْكَانَ عَنِ ابْنِ أَبِي يَعْفُورٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ إِذَا سَجَدَتِ الْمَرْأَةُ بَسَطَتْ ذِرَاعَيْهَا.
4. Ahmad ibn Muhammad has narrated from al-Husayn ibn Sa‘id from ‘Uthman ibn ‘Isa from ibn Muskan from ibn abu Ya‘fur who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘When a woman performs Sajdah (prostration) she must stretch her arms.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī