Sefer Chasidim Siman 81
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.
כשתתיירא מן החרטה אמור לאו קודם הן כי לאו אחר הן מגונה מאד. וכאשר תאמר הן כפול קיים מה שאמרת:
Sefaria Community Translation
If you are fearful of later regrets, say “no” before “yes.” But to say “no” after having said “yes” is quite reprehensible. If you say “yes” twice, fulfill it.¹
footnotes: ¹ Rashi, Genesis 8:21. The repetition is tantamount to an oath.