What are the things the Jews asked Quraysh to question the Messenger about, in order to cast doubt on his prophethood?

The questions posed by the Jews to the Prophet, peace and blessings be upon him, are mentioned in Sahih al-Bukhari and Musnad Ahmad. They are:

1. Questions of Abdullah ibn Salam (before his conversion to Islam): Concerning the first sign of the Hour (a fire that gathers people), the first food of the people of Paradise (the caudate lobe of the whale's liver), and the reason a child resembles his father or mother (based on whether the man's or woman's fluid precedes).

2. Questions of a delegation of Jews: Concerning the food that Israel forbade for himself (camel meat and milk), how male and female offspring are conceived and resemblance occurs (based on the dominance of the man's or woman's fluid), how the unlettered Prophet slept (his eyes would sleep but his heart would not), and who his guardian angel was (Jibril, peace be upon him). Upon the mention of Jibril, the Jews refused to follow him because he was their enemy.