Musannaf Ibn Abi Shayba 7:326

Abu al-Ahwas narrated to us, from 'Ata' ibn al-Sa'ib, from a man among them, who said: I asked Ibn Abbas. I said: "I have sworn an oath that I will not speak to a man for a *hin* (a period of time)." Ibn Abbas recited: "It gives its fruit at all times (*hin*) by the permission of its Lord." He said: "The *hin* is a year."