question #1 Sahih al-Bukhari 4903, Book 65, Hadith 423 : What challenges did the companions face during their journey with the Prophet (ﷺ) due to lack of provisions?

We went out with the Prophet (ﷺ) : on a journey and the people suffered from lack of provisions. So
`Abdullah bin Ubai said to his companions, “Don’t spend on those who are with Allah’s Messenger (ﷺ), that
they may disperse and go away from him.” He also said, “If we return to Medina, surely, the more
honorable will expel therefrom the meaner. So I went to the Prophet (ﷺ) and informed him of that. He sent
for `Abdullah bin Ubai and asked him, but `Abdullah bin Ubai swore that he did not say so. The
people said, “Zaid told a lie to ‘Allah’s Messenger (ﷺ).” What they said distressed me very much. Later Allah
revealed the confirmation of my statement in his saying:–
‘(When the hypocrites come to you.’ (63.1) So the Prophet (ﷺ) called them that they might ask Allah to
forgive them, but they turned their heads aside. (Concerning Allah’s saying: ‘Pieces of wood propped
up,’ Zaid said; They were the most handsome men.)