Musannaf Ibn Abi Shaybah

Hasan (may Allah have mercy on him) disliked selling wheat and similar items before taking possession of them.

Hazrat Qatadah did not consider it objectionable to sell wheat before taking possession of it, and he said that this is well-known.

Muhammad, may Allah have mercy on him, used to dislike this.

Hazrat Ata (may Allah have mercy on him) also did not consider there to be any harm in selling by measure before taking possession.

Hazrat Saeed (may Allah have mercy on him) says that whoever buys something by measure or weight should not sell it to someone else before taking possession of it, but he did not consider it objectionable to sell by estimation, or to make someone a partner without measuring or weighing.

It is narrated from Hazrat Saeed bin Al-Musayyib (may Allah have mercy on him) in a marfu’ form that the Noble Prophet (peace and blessings be upon him) said: There is no harm in selling, gifting, or entering into partnership before delivery (before taking possession).