必

锱铢必较

zī zhū bì jiào

to haggle over every cent (idiom)

阴德必有阳报

yīn dé bì yǒu yáng bào

hidden merits will have visible rewards (idiom)

非必需

fēi bì xū

inessential

骄兵必败

jiāo bīng bì bài

lit. an arrogant army is bound to lose (idiom)

骄者必败

jiāo zhě bì bài

pride goes before a fall (idiom)

三人行，则必有我师

sān rén xíng , zé bì yǒu wǒ shī

If three walk together, one of them can teach me sth (Confucius)

三人行，必有我师

sān rén xíng , bì yǒu wǒ shī

lit. if three walk together, one can be my teacher (idiom, from the Analects of Confucius)

不必

bù bì

need not

不必要

bù bì yào

needless; unnecessary

事必躬亲

shì bì gōng qīn

to attend to everything personally

二虎相斗，必有一伤

èr hǔ xiāng dòu , bì yǒu yī shāng

see 兩虎相爭，必有一傷|两虎相争，必有一伤[liang3 hu3 xiang1 zheng1 , bi4 you3 yi1 shang1]

人无远虑，必有近忧

rén wú yuǎn lǜ , bì yǒu jìn yōu

He who gives no thought to far-flung problems soon finds suffering nearby (idiom, from Analects).