Musannaf Ibn Abi Shayba 7:6

Waki’ narrated to us, from Isma’il ibn Abi Khalid, from al-Sha’bi, from Masruq, who said: Vows are of two types: a vow to Allah and a vow to Satan. As for what is for Allah, it requires fulfillment and expiation. And as for what is for Satan, there is no fulfillment in it, nor is there any expiation.