Var.: По крупице и птица собирает, а сыта бывает
Cf: Drop by drop and the pitcher is full (Am.). Grain by grain and the hen fills her belly (Br.). Little and often fills the purse (Am., Br.). Little and often makes a heap in time (Am.). A little makes a lot (Am.). Many a little (a pickle) makes a mickle (Br.). Many a mickle makes a muckle (Am.). One grain fills not the sack, but it helps his fellow (Br.). A pin a day is a groat a year (Am., Br.)Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.