不是

nǐ xiān chū kǒu shāng rén nà zhè jiù shì nǐ de bù shi le

你先出口伤人，那这就是你的不是了。

It's your fault, because you were the first to speak bitingly.

tā zì jǐ bù rèn cuò hái zhǎo bié rén de bù shi

他自己不认错，还找别人的不是。

Instead of admitting his mistakes, he shifted the blame onto others.