Musa b. Talha reported:
I and Allah's Messenger ( صلی اللہ علیہ وسلم ) happened to pass by people near the date-palm trees. He (the Holy Prophet) said: What are these people doing? They said: They are grafting, i. e. they combine the male with the female (tree) and thus they yield more fruit. Thereupon Allah's Messenger ( صلی اللہ علیہ وسلم ) said: I do not find it to be of any use. The people were informed about it and they abandoned this practice. Allah's Messenger ( صلی اللہ علیہ وسلم ) (was later) on informed (that the yield had dwindled), whereupon he said: If there is any use of it, then they should do it, for it was just a personal opinion of mine, and do not go after my personal opinion; but when I say to you anything on behalf of Allah, then do accept it, for I do not attribute lie to Allah, the Exalted and Glorious.