Halakhah for Shevuot 41:3
מיתיבי אי זו היא שבועת שוא נשבע לשנות את הידוע לאדם שבועת שקר נשבע להחליף אימא נשבע ומחליף
When R. Abin came [from Palestine], he said that R. Jeremiah said that R. Abbahu said that R. Johanan said: '[I swear] I have eaten', '[I swear] I have not eaten' [and it was untrue], are false oaths, and their prohibition is from: Ye shall not swear by My name falsely. '[I swear] I shall eat', '[I swear] I shall not eat' [and he broke the oath], he transgresses: He shall not break his word. And what is a vain oath? Swearing that which is contrary to the facts known to man.
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