What is the sentence in classical Chinese that says "Be yourself first, then take care of others"?

Law-abiding people must be self-disciplined first.

self-denial

Be strict with yourself and be lenient with others.

Don't do unto others what you don't want done unto you.

Sit still and think about yourself all the time. Gossip is not personal.

Classical Chinese is a processed written language based on ancient Chinese. The earliest written language based on spoken language may have been processed. Classical Chinese is an article composed of written language in ancient China, mainly including written language based on spoken language in pre-Qin period. During the Spring and Autumn Period and the Warring States Period, no articles were invented to record characters, but bamboo slips, silks and other things were used to record characters, and silks were expensive, bamboo slips were huge and the number of words recorded was limited. In order to record more things on a roll of bamboo slips, unimportant words were deleted. Later, when "paper" was used on a large scale, the habit of using "official documents" among the ruling classes had been finalized, and the ability to use "classical Chinese" had evolved into a symbol of reading and literacy. Classical Chinese comes from vernacular Chinese, characterized by writing based on words, paying attention to the use of allusions, parallel prose, and neat melody, including strategies, poems, words, songs, stereotyped writing, parallel prose and other styles. The classical Chinese in modern books are generally marked with punctuation marks in order to facilitate reading and understanding.