не плюй в колодец, пригодится воды напиться

• НЕ ПЛЮЙ В КОЛОДЕЦ, ПРИГОДИТСЯ ВОДЬ! НАПИТЬСЯ{{}}

[saying]

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⇒ do not do harm to or show disregard for another person because, in the future, you may come to need his help or support:

- ≈ cast no dirt in the well that gives you water;

- don't spit into the well, you may have to (need to) drink from it one day (someday);

- don't spit into a cup from which you may someday drink;

- chickens will always come home to roost.

     ♦ [author's usage] После обряда он [поп Виссарион] поздравил молодых, назидательно сказал: "Вот, молодой советский товарищ, как бывает в жизни: в прошлом году вы собственноручно сожгли мой дом... а сегодня мне пришлось вас венчать... Не плюй, говорят, в колодец, ибо он может пригодиться" (Шолохов 5). After the [wedding] ceremony he [Father Vissarion] congratulated the young couple, and said didactically, "So there you are, young Soviet comrade, that's how it is in life. Last year you burnt down my house with your own hands...and today I have to marry you. Don't spit into the well, they say, because you may need to drink from it one day" (5a).