Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
ὁBooz, Boz rico labrador, LXX Ru.2.1, passim, antepasado de Jesús, Eu.Luc.3.32.
