Why did the Prophet (peace and blessings be upon him) not mention fasting and Hajj when he sent Mu'adh to Yemen?

Question : That is, regarding the one who prays with him, Mu'adh did not mention fasting and Hajj, even though he had adopted them from the beginning of his Islam.

Answer : Yes, the answer to this is to say that the Messenger (peace and blessings be upon him) sent him in Rabi' al-Awwal. How many months remained until Ramadan? Rabi' al-Thani, Jumada al-Ula, Jumada al-Akhirah, Rajab, and Sha'ban—five months. So he did not overwhelm them with all the pillars at once, so that they would settle in. And Hajj is further away than Ramadan.