Which parts of this excerpt from Beowulf relate to a warrior code?

Beowulf answered, Ecgtheow's son:
"Grieve not, O wise one! for each it is better,
His friend to avenge than with vehemence wail him;
Each of us must the end-day abide of
His earthly existence; who is able accomplish
Glory ere death! To battle-thane noble
Lifeless lying, 'tis at last most fitting.
Arise, O king, quick let us hasten
To look at the footprint of the kinsman of Grendel!
I promise thee this now: to his place he’ll escape not, . . ."