It is narrated from Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever cultivates the land of a people without their permission has no share in the crop, and he is to be given only his expenses."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المزارعة / 11742