al-Hasan bin 'Ali al-Halwani الحسن بن علي الخلال الحلواني · Wages (Kitab Al-Ijarah)

Some of the Companions of Prophet (ﷺ) went on a journey. They encamped with a clan of the Arabs and sought hospitality from them, but they refused to provide them with any hospitality. The chief of the clan was stung by a scorpion or bitten by a snake. They gave him all sorts of treatment, but nothing gave him relied. One of them said: Would that you had gone to those people who encamped with you ; some of them…

The Messenger of Allah (ﷺ) as saying: If anyone buys a grain, he should not sell it until he takes possession of it. Sulaiman b. Harb said: Until he receives it in full. Musaddad added: Ibn 'Abbas said: And I think that everything is like grain.