“Shafa” refers to even-numbered units in prayers, such as the 2nd and 4th Rak’ahs in Dhuhr, Asr, and Isha. “Witr” specifically denotes the odd-numbered unit in the Isha prayer, typically observed as 1, 3, 5, 7, 9, or 11 Rak’ahs, and is a distinct and recommended part of the Isha prayer. Both are essential components of the Islamic prayer routine.
