He was asked whether the Messenger of Allah ﷺ used to command any prayer after the obligatory prayer or besides the obligatory prayer.He replied, "Yes, between Maghrib and Isha."
حدثنا معتمر عن أبيه عن رجل
سئل أكان رسول الله ﷺ يأمر بصلاة بعد المكتوبة أو سوى المكتوبة قال نعم بين المغرب والعشاء
No references are available.
Its isnad is daif, due to the unknown identity of the narrator from Ubayd. Haythami mentioned it in 2/229 and said, "It rests on a man he did not name."