that the Prophet (ﷺ) said: "Whoever farms a people's land without their permission, then nothing he farms belongs to him and its finances are due to him."
Jami` at-Tirmidhi Book 15, Hadith 47
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Jami` at-Tirmidhi Book 15, Hadith 46 Next Hadith → That his father gave a slave to a son of his. So he went to the Prophet (ﷺ) to have him witness it. He (ﷺ) said: 'Have you given a gift similar to this one to all of your sons?' He replied: 'No'. So he said: 'Then take him back.'"

Jami` at-Tirmidhi Book 15, Hadith 48