dont bite off more than you than chew

لقمه گنده تر از دهان برداشتن

It means that you should try to do one important thing at a time and if someone takes too much work or too many challenges we use this proverb"dont bite more than you can chew " also the similar Arabic proverb is "you can not carry two watermelons in one hand " in persion means
لقمه گنده تر از دهان برداشتن یا بیشتر از توان مسئولیت کاری رو بر عهده گرفتن