Musar for Bava Kamma 76:7

ואמר ר' חייא בר אבא אמר ר' יהושע בן קרחה לעולם יקדים אדם לדבר מצוה שבשביל לילה אחת שקדמתה בכירה לצעירה קדמתה ארבע דורות לישראל עובד ישי ודוד ושלמה ואילו צעירה עד רחבעם דכתיב (מלכים א יד, כא) ושם אמו נעמה העמונית

For the younger [had no descendant in Israel] until [the advent of] Rehoboam, as it is written: And the name of his mother was Naamah the Ammonitess.10 Our Rabbis taught: If cattle of an Israelite has gored cattle belonging to a Cuthean<span class="x" onmousemove="('comment',' I.e., members of the mixed tribes who had been settled on the territory of the former Kingdom of Israel by the Assyrian king and who were subsequently a great hindrance to the Jews who returned from the Babylonian captivity to revive their country and their culture; cf. II Kings, XVII. 24-41; Ezra IV, 1-24 and Neh. III, 33; IV, V, VI, 13. ');">11

Shenei Luchot HaBerit

Our sages in Baba Kama 38 say that a person should always perform a מצוה at the earliest possible opportunity, because of the single night that Lot's older daughter preceded her younger sister (in sleeping with her father), she merited that the maternal founder of the Davidic dynasty Ruth was born four generations sooner than Na'amah, the future wife of Rechavam son of Solomon. G–d examines the motives of people. Although what the daughters of Lot did appears as brazen, G–d knew that their motivation was pure. It was an עבירה לשמה, a sin performed for the sake of G–d. If prompt performance of such a dubious act brings such reward in its wake, how much more must one hurry to perform those מצות promptly that are clearly means of sanctifying oneself.

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