What is meant by the first, second, and third in Ibn al-Qayyim's statement in his book *Al-Zad* on Prophetic Medicine: hot in the first, cold in the second, and so on?

The questioner : Many students of knowledge ask about Ibn al-Qayyim's statement in *Al-Zad* on Prophetic Medicine: "hot in the first, cold in the second, and so on." What does he mean by the first, second, and third?

The Shaykh : These are medical terms that we do not understand.

The questioner : ...

The Shaykh : And Allah was pleased with the Companions of the Prophet (peace and blessings be upon him), just as He was pleased with the Companions of the Tree. So there is no doubt that with these two conditions, one becomes a disbeliever.