Musannaf Ibn Abi Shayba 13:1367

Abu Bakr narrated to us, he said: Abu Khalid al-Ahmar narrated to us, from Yahya ibn Sa'id, from Sa'id, who said: "Whoever buys something by measure or by weight, let him not sell it until he takes possession of it." And he did not see any harm in him transferring it (at cost) or making someone a partner in it without measuring or weighing.