БОГ ТРОИЦУ ЛЮБИТ (saying) the third person or thing, when added to two others, is likely to bring luck or a sense of completeness, the third attempt is likely to be successful: = three is the magic numberthree (third time) is a charmall good things come in threesthird time lucky.
(Зилов:) Слушай! Бог троицу любит. Бросим третий раз. Решка - признаемся, орёл - нет (Вампилов 5). (Z.:) Listen! Three's a charm. Let's toss a third time. Tails, we own up, heads, we don't (5b).

Большой русско-английский фразеологический словарь 

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