Positive commandment · Mitzvat Aseh #210 of 613
To honor one's father and mother
לכבד אב ואם
The verse · Shemot 20:12
כַּבֵּד אֶת־אָבִיךָ וְאֶת־אִמֶּךָ לְמַעַן יַאֲרִכוּן יָמֶיךָ עַל הָאֲדָמָה אֲשֶׁר־ה׳ אֱלֹהֶיךָ נֹתֵן לָךְ
“Honour thy father and thy mother: that thy days may be long in the land which the Lord thy God gives thee.”
The Rambam’s words
To honor one's father and mother, as [Exodus 20:12] states: "Honor your father and mother."
לכבד אב ואם, שנאמר "כַּבֵּד אֶת אָבִיךָ וְאֶת אִמֶּךָ" (שמות כ, יא); (דברים ה, טו).
Why · Sefer HaChinuch #33
Honor father and mother
“From the roots of this commandment is that it is fitting for a person to acknowledge and return kindness to people who were good to him, and not to be an ungrateful scoundrel, because that is a bad and repulsive attribute before G-d and people.”
Who & when
“And [it] is practiced in every place and at all times by males; and by females (Kiddushin 31a) any time it is possible for them — meaning to say when their husbands do not prevent them.”
Where in the Mishneh Torah
Hilchot Rebels הלכות ממרים