Riyad as-Salihin

Abu Sa'id Al-Khudri (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "The best possession of a Muslim will be a herd of sheep with which he retires to the top of a mountain or places where rain is expected to fall (pastures) so as to safeguard with his faith from tribulation."

[Al- Bukhari].