"The Messenger of Allah (ﷺ) prohibited Al-Muhaqalah, Al-Muzabanah, Al-Mukhabarah, and making an exception (in a sale) unless it is made known."

This Hadith is Hasan Sahih, Gharib from this route as narration of Yunus bin 'Ubaid, from 'Ata, from Jabir.
Jami` at-Tirmidhi Book 14, Hadith 92
← Previous Hadith From his father, from his grandfather, that the Prophet (ﷺ) was asked about hanging fruits (on the trees), so he said: "Whoever is in need and picks some of it without taking any in his garment, then there is no sin upon him."

This Hadith is Hasan Sahih.

Jami` at-Tirmidhi Book 14, Hadith 91 Next Hadith → That the Prophet (ﷺ) said: "Whoever buys food, then he is not to sell it until he takes possession of it." Ibn 'Abbas said: "All things are considered the same (in this regard)."

There are narrations on this topic from Jabir, Ibn 'Umar, and Abu Hurairah.

The Hadith of Ibn 'Abbas is a Hasan Sahih Hadith.

Jami` at-Tirmidhi Book 14, Hadith 93