Musannaf Ibn Abi Shayba 13:2174

Abu Bakr narrated to us, he said: Ali bin Mushir narrated to us, from Abd al-Malik, from Ata, regarding a man who sells grape juice to someone who makes it into wine: He said: It is more beloved to me that he sells it to someone who will not make it into wine, but if he sells it [to him], there is no harm.