Reference for Sotah 37:1
דכתיב זאת בשני אנשים ושני בועלין דכולי עלמא לא פליגי דהאשה שותה ושונה דכתיב תורת
for it is written 'This'. In the case of two husbands and two paramours none differ that a woman drinks and does so again, for it is written 'the law of. Where they differ is in the case of the same husband and two paramours, or two husbands and the same paramour. The first Tanna holds that 'the law of indicates the inclusion of them all, and 'This' indicates the exclusion of the case of the same husband and the same paramour. The Rabbis hold that 'This' indicates the exclusion of them all, and 'the law of indicates the inclusion of the case of two husbands and two paramours. R. Judah holds that 'This' is to exclude two cases and 'the law of is to include two cases. 'This' is to exclude two cases, viz., the same husband and the same paramour, and the same husband and two paramours; 'the law of is to include two cases, viz., two husbands and the same paramour, and two husbands and two paramours.