a bird in the hand is worth two in the bush
US /ə bɜrd ɪn ðə hænd ɪz wɜrθ tu ɪn ðə bʊʃ/
UK /ə bɜrd ɪn ðə hænd ɪz wɜrθ tu ɪn ðə bʊʃ/

1.
it is better to hold on to something you already have than to risk losing it by trying to get something better
:
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I know the new job offers more money, but a bird in the hand is worth two in the bush, so I'm staying with my current stable position.
•
He decided not to sell his small business, thinking a bird in the hand is worth two in the bush, even though a larger company showed interest.