From the Suda:
“You control a lentil’s corner”: A proverb used for weak people. There is also this proverb: “you are chopping a lentil”—something said of things that are endless and imaginary.”
Φακοῦ γωνίαν κρατεῖς• ἐπὶ τῶν ἀδυνάτων. παροιμία• Φακὸν κόπτεις• ἐπὶ τῶν ἀνηνύτων καὶ μὴ ὄντων λέγεται.
“Phôkos: A porpoise. But also a proverb: “A Feast of Phôkos.” This is used for those who accrue harm when they prepare a dinner-party. For there was a man named Phôkos who was trying to marry off his daughter. There were many courting here but when he prepared the feast and entertained the suitors he put off the wedding. Because the suitors were angry about this, they killed Phôkos at his own dinner-party”
Φῶκος. καὶ παροιμία• Φώκου ἔρανος• κατὰ τῶν εὐωχίας συναγόντων ἐπὶ τῷ ἑαυτῶν κακῷ• Φῶκος γάρ τις θυγατέρα ἔχων ἐπὶ γάμῳ, πολλῶν αὐτὴν μνηστευομένων, ἐράνους συνῆγε καὶ ἑστιῶν τοὺς μνηστῆρας ἀνεβάλλετο τὸν γάμον. ὀργισθέντες οὖν ἐκεῖνοι ἐν τῷ συμποσίῳ ἀπέκτειναν τὸν Φῶκον.