君子一言，快马一鞭君子一言，快馬一鞭 in English
- (idiom) Once a promise is given, it is kept / one does not go back on one’s word.
Stroke order
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation 
Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
How it used to be written
君
-
Oracle bone script 商 -
Clerical script 東漢 - See all 21 forms
子
-
Oracle bone script 商 -
Clerical script 西晉 - See all 32 forms
一
-
Oracle bone script 商 -
Clerical script 孫吳 - See all 14 forms
言
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Oracle bone script 商 -
Clerical script 東漢 - See all 13 forms
快
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Chu manuscripts 戰國.楚 -
Clerical script 西漢 - See all 8 forms
马
These are the forms of 馬, the traditional character: 马 is a twentieth-century simplification, found in no ancient corpus.
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Oracle bone script 商 -
Clerical script 西晉 - See all 35 forms
鞭
-
Bronze script 西周中期 -
Small seal script - See all 11 forms
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).