Sayyiduna Abu Hurairah (may Allah be pleased with him) reports that my beloved friend (ﷺ) advised me regarding three things: to fast three days every month, to perform Witr before sleeping, and to offer two units of Duha (forenoon) prayer.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صلاة الضحى / 1222