The knights of the round table were bound by the code of chivalry that called for loyalty to king, god, and lady. in which lines of this excerpt from sir gawain and the green knight does sir gawain describe upholding this code?

as you promised in presence of these proud knights.
to the green chapel come, i charge you, to take
such a dint as you have dealt--you have well deserved.

and the loss of my life would be least of any;
that i have you for uncle is my only praise;
my body, but for your blood, is barren of worth;
and for that this folly befits not a king,
and 'tis i that have asked it, it ought to be mine,

by heaven, i would hold me the happiest of men
if by word or by work i once might aspire
to the prize of your praise--'twere a pure joy! '

"behold , sir," said he, and handles the belt,
"this is the blazon of the blemish that i bear on my neck;
this is the sign of sore loss that i have suffered there;
for the cowardice and coveting that i came to there;
this is the badge of false faith that i was found in there,