βεβαιωτέον
From LSJ
τὸν τεθνηκότα μὴ κακολογεῖν → do not speak ill of the dead, speak no ill of the dead (Chilon the Spartan)
English (LSJ)
one must confirm, ὅρκους Ph.2.272; ὑπόσχεσιν Id.1.23.
Spanish (DGE)
hay que confirmar πάντας ... ὅρκους Ph.2.272, τὴν δ' ὑπόσχεσιν ἀποδείξει β. Ph.1.23
•fil. hay que demostrar D.L.9.91.
Greek (Liddell-Scott)
βεβαιωτέον: ῥηματ. ἐπίθ., πρέπει τις νὰ ἐπιβεβαιώσῃ, νὰ καταστήσῃ βέβαιον, ὅρκον Φίλων 2. 272.