How sound is the Hadith about the Prophet's entry into Paradise and his seeing a palace there for Umar ibn al-Khattab, and what is the explanation of the phrase: "Were it not for what I know of your ghīra (protective jealousy), I would have entered it"?

The aforementioned Hadith is authentic, narrated by Al-Bukhari and others through several transmissions. Among them is that the Prophet, peace and blessings be upon him, saw a palace in Paradise. When he inquired about it, he was told it belonged to Umar ibn Al-Khattab. The Prophet then recalled Umar's protective jealousy and turned away from it. Thereupon, Umar wept and said, "Would I be jealous of you, O Messenger of Allah?" The meaning is that the intensity of Umar's protective jealousy prevented the Prophet from entering the palace.