Sunan Abi Dawud — Tribute, Spoils, and Rulership (Kitab Al-Kharaj, Wal-Fai' Wal-Imarah) — Hadith No: 3078
Translation
Hisham said “The unjust vein means that a man implants a tree in the land of another man so that they may be entitled to it. Malik said “The unjust vein means that a man takes (a thing) digs a pit and implants a tree without (his) right