question #3 Sahih Muslim 704c, Book 6, Hadith 58 : What are the specific conditions under which prayers can be combined according to Islamic teachings?

Anas reported that when the Messenger of Allah (ﷺ) had to set out on a journey hurriedly, he delayed the noon prayer to the earlier time for the afternoon prayer, and then he would combine them, and he would delay the sunset prayer to the time when the twilight would disappear and then combine it with the ‘Isha’ prayer.