Witr when combining Salahs due to heavy rain

Q 1: When combining `Isha' (Night) Prayer with Maghrib (Sunset) Prayer at the latter's time due to rainfall, is it permissible to perform Shaf`` (two units of Prayer, particularly before the final unit of the odd-number prayer) and Witr (Prayer with an odd number of units) in the Masjid (mosque) after the combined prayers? Or should one wait until the actual time of `Isha prayer, offer it and follow it by the Sunnah (supererogatory) prayer then Shaf` and Witr? What is the soundest opinion in this regard? Kindly let us know, may Allah reward you!

A: If you combine `Isha' with Maghrib Prayers at the time of the latter due to a legal excuse, it is permissible to offer Witr after them. However, delaying the Witr prayer to the last portion of the night is actually much better if possible.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.