late 13c., from Old French haster "hurry, make haste; urge, hurry along" (Modern French hâter), from haste "haste, urgency" (see haste). Now largely superseded by hasten (1560s). Related: Hasted; hasting.
word-forming element making verbs (such as darken, weaken) from adjectives or nouns, from Old English -nian, from Proto-Germanic *-inojan (also source of Old Norse -na), from PIE adjectival suffix *-no-. Most active in Middle English and early modern English, hence most verbs in -en are comparatively recent.
<a href="https://www.etymonline.com/word/hasten">Etymology of hasten by etymonline</a>
Harper, D. (n.d.). Etymology of hasten. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/hasten