1: ὀφείλω
(Strong's #3784 — — opheilo — of-i'-lo, of-i-leh'-o )

"to owe," is once rendered "behove," Hebrews 2:17; it indicates a necessity, owing to the nature of the matter under consideration; in this instance, the fulfillment of the justice and love of God, voluntarily exhibited in what Christ accomplished, that He might be a merciful and faithful High Priest. See BOUND , DEBT , DUE , DUTY , GUILTY , INDEBTED , MUST , NEED , OUGHT , OWE.

2: δεῖ
(Strong's #1163 — Verb — dei — die, deh-on' )

"it is necessary," is rendered "behoved," in Luke 24:46; RV, (that the Christ) "should" (suffer). Dei expresses a logical necessity, opheilo, a moral obligation; cp. chre, James 3:10 , "ought," which expresses a need resulting from the fitness of things (Trench, cvii). See MEET , MUST , NEED , OUGHT.