Sefer Chasidim Siman 78
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
אל תביא עצמך לידי עבירה קלה כי היא יביאך לידי חמורה עבר על לא תשנא סוף בא לידי שפיכות דמים שנאמר (דברים יט יא) וכי יהיה איש שונא לרעהו וארב לו וקם עליו והכהו:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
Do not bring yourself to a light transgression for it will bring you to a more serious one. If one transgressed the injunction “Thou shalt not hate” he ultimately comes to the “spilling of blood (murder),” for it is said, “But if any man hate his neighbor and lie in wait for him and rise up against him and smite him mortally that he die” (Deut. 19:11).¹
footnotes: ¹ Aboth 4:2.