Asma' bint Yazid (May Allah be pleased with her) reported:
The Messenger of Allah (ﷺ) passed through the mosque one day and there was a group of women (about ten of them) sitting in the mosque. He raised his hand to offer greetings.[At- Tirmidhi]. (ES)
App reference (ES): Book 6, Hadith 11 (ES)
Arabic/English book reference (ES): Book 6, Hadith 855 (ES)