Someone asked Hazrat Ubaid (may Allah be pleased with him) whether the Holy Prophet (peace and blessings of Allah be upon him) used to instruct any prayer besides the obligatory prayers. He replied, "Yes! He used to instruct (prayer) between Maghrib and Isha."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 23652
Hadith Gradingحکم دارالسلام:إسناده ضعيف لجهالة الراوي عن عبيد