Musannaf Ibn Abi Shaybah 22362 — Those who disliked restricting a free

It is narrated from Abd al-Malik bin al-Mughirah (may Allah have mercy on him) that Najdah wrote to Sayyiduna Ibn Abbas (may Allah be pleased with them both), asking about the aged man whose reason has gone or who has lost his understanding: (what is the ruling on him?) He (may Allah be pleased with him) wrote back to him: "When his reason has gone or he has lost his understanding, he is to be barred from trading and the like."