ἐγγυᾶσθαι
From LSJ
αὐτῇ τῇ ψυχῇ αὐτὴν τὴν ψυχὴν θεωροῦντα ἐξαίφνης ἀποθανόντος ἑκάστου → beholding with very soul the very soul of each immediately upon his death
Greek > English (Woodhouse Verbs Reversed)
(see also ἐγγυάω): guarantee, pledge, answer for, give security for a person, give security, give surety offer bail, have betrothed to one, offer bad, pledge oneself