What is the legal evidence for the permissibility of combining the two prayers by advancing or delaying them?

The questioner : May Allah reward you, our Shaykh. The question asks: What is the legal evidence for the permissibility of combining the two prayers by advancing them? And if the evidence is presented, what is the ruling on restricting oneself to that and not combining by delaying, as many Muslims do today?

The Shaykh : First, I want to correct the question, or at least define it. It is in the end of the question where it says: "as Muslims do today." Muslims today combine for the rain. This rain is what necessitates that the combination be by advancing and not by delaying. So, it is as if heThe questioner : is ignorant or does not know that combining for the rain is explicitly mentioned in the hadith narrated by Muslim, from the hadith of Ibn Abbas, who said: "The Messenger of Allah (peace and blessings be upon him) combined the Dhuhr and Asr prayers, and the Maghrib and Isha' prayers, in Madinah, without travel or rain." They said: "What did he intend by that, O Abu al-Abbas?" (Abu al-Abbas is the kunya of Abdullah ibn Abbas). "What did he intend by that, O Abu al-Abbas?" He said: "He intended not to burden his Ummah." The point of the hadith is Ibn Abbas's statement "without travel or rain." Here, there is an indication that it was established and known among the people addressed that combining due to the excuse of travel and combining due to the excuse of rain was a well-known and famous matter among them. Therefore,