καρτερεῖν
From LSJ
ἀλλὰ διὰ τῆς ἀγάπης δουλεύετε ἀλλήλοις. ὁ γὰρ πᾶς νόμος ἐν ἑνὶ λόγῳ πεπλήρωται, ἐν τῷ Ἀγαπήσεις τὸν πλησίον σου ὡς σεαυτόν → but be enslaved to each other through love; for the whole Torah is fulfilled in one statement: You will love your neighbor as yourself (Galatians 5:13f.)
Greek > English (Woodhouse Verbs Reversed)
(see also καρτερέω): continue, endure, persevere, persist, be firm, be patient, be resigned, be steadfast, hold out against, hold out, keep on, maintain one's ground, not to yield, remain steady, stand firm
Lexicon Thucydideum
labores perferre, to undergo hardships, 2.44.3, 4.66.3, 7.48.2, 7.64.2.