Extended Strong's Greek Lexicon (Abbott-Smith based)
to make a covenant
Usage: δια-τίθημι [in LXX chiefly for כָּרַת, frequently δ. διαθήκην (כָּרַת) ;] to place separately, arrange, dispose. Mid, only in NT; __1. (a) in general, to dispose of; with dative of person(s), to assign to one, Luk.22:29; __(b) to dispose of by a will, make a testament (in cl., δ. διαθήκην also in this sense): Heb.9:16-17 (but cf. R, mg., and see: διαθήκη). __2. δ. διαθήκην, to make a covenant (Aristoph.): with dative of person(s), Heb.8:10 (LXX);
before πρ, with accusative of person(s), Act.3:25, Heb.10:16" (LXX) (cf. ἀντι-διατίθημι).† (AS)