Mesorat%20hashas for Shevuot 51:2

ר' ישמעאל אומר אינו חייב אלא על העתיד לבא: ת"ר (ויקרא ה, ד) להרע או להיטיב אין לי אלא דברים שיש בהן הרעה והטבה שאין בהן הרעה והטבה מנין תלמוד לומר (ויקרא ה, ד) או נפש כי תשבע לבטא בשפתים

R. ISHMAEL SAYS, HE IS LIABLE ONLY FOR [AN OATH IN] THE FUTURE. Our Rabbis taught: To do evil, or to do good. [From this] we know only such cases where doing evil and doing good are applicable; but how do we know such cases where doing evil and doing good are not applicable? Because it is said, Or if anyone swear clearly with his lips. [From this] we know only [oaths in] the future; how do we know [oaths in] the past? Because it is said: Whatsoever it be that a man shall utter clearly, with an oath. This is the opinion of R. Akiba. R. Ishmael says: To do evil, or to do good implies the future. R. Akiba said to him: If so, we know only such cases where doing evil and doing good are applicable; how do we know such cases where doing evil and doing good are not applicable? He replied to him: From the amplification of the verse. Whereupon he said to him: If the verse amplified for that, it amplified for this also. Well did R. Akiba reply to R. Ishmael! - R. Johanan said: R. Ishmael who ministered to R. Nehunia b. Hakanah, who expounded the whole Torah on the principle of generalisation and specification, also expounded it on the principle of generalisation and specification; R. Akiba who ministered to Nahum of Gamzu, who expounded the whole Torah on the principle of amplification and limitation, also expounded it on the principle of amplification and limitation.

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