Al-Qasim bin Abd al-Rahman (may Allah have mercy on him) said: Abdullah (may Allah be pleased with him) bought kharaj land, and its owner, meaning its dihqan (local landlord), said to him: I will pay the kharaj on your behalf and also look after the land.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18403