Commentary for Shevuot 39:4

ת"ר מבטא שבועה איסר שבועה איסור איסר אם אתה אומר איסר שבועה חייב ואם לאו פטור אם אתה אומר איסר שבועה והא אמרת איסר שבועה הוא

An objection was raised; [for it has been taught:] What is issar which is mentioned in the Torah? He who says: I take it upon me that I shall not eat meat, and that I shall not drink wine, as on the day that my father died, or, as on the day that So-and-So died, or, as on the day that Gedaliah, son of Ahikam, was killed, or, as on the day that I saw Jerusalem in its destruction; he is prohibited [from eating meat, etc.]; and Samuel said: only if he had already made a vow on that day. Now, it is well, according to Abaye, for just as that which is tacked on to a vow is a vow, so that which is tacked on to an oath is an oath;

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