Something that you already have is better than something else you may get later especially if there is the risk of losing what you already have.
آنچه هم اکنون داری بهتر از آن چیز دیگری است که ممکن است بعدا به دست بیاوری. مخصوصا اگر این خطر وجود داشته باشد که چیزی را هم که داری از دست بدهی.
سیلی نقد به از حلوی نسیه
گنجشک به دست به از باز پریده
She said she would come and help us next week, but I really don't trust her. She might not come again next week. I think we had better do part of the job just today. You know better that a bird in the hand is worth two in the bush.