Silsilah as-Sahihah 1420 — Abandoning evil vows and their expiation

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) said: "There are two types of vows. One vow is for Allah, its expiation is to fulfill it, and one vow is for Satan, it should not be fulfilled, but the expiation of an oath will be due upon it."