It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that my beloved friend (peace and blessings be upon him) advised me of three things: (1) to perform Witr prayer before sleeping, (2) to fast three days in every month, (3) to offer the Duha (forenoon) prayer, for it is the prayer of those who turn to Allah.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7596
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 1178، م: 721، وهذا إسناد ضعيف للراوي المبهم، وهو سليمان: مجهول.