John 8:6

τοῦτο δὲ … αὐτοῦ. “And this they said tempting Him,” hoping that His habitual pity would lead Him to exonerate the woman. [“Si Legi subscriberet, videri poterat sibi quodammodo dissimilis,” Calvin. προσεδόκων ὅτι φείσεται αὐτῆς, καὶ λοιπὸν ἕξουσι κατηγορίαν κατʼ αὐτοῦ ὡς παρανόμως φειδομένου τῆς ἀπὸ τοῦ νόμου λιθαζομένης, Euthymius.] The dilemma supposed by Meyer is not to be thought of. See Holtzmann. Their plot was unsuccessful; Jesus as He sat (John 8:2), κάτω κύψας … γῆν, “bent down and began to write with His finger on the ground,” intimating that their question would not be answered; perhaps also some measure of that embarrassment on account of “shame of the deed itself and the brazen hardness of the prosecutors” which is overstated in Ecce Homo, p. 104. The scraping or drawing figures on the ground with a stick or the finger has been in many countries a common expression of deliberate silence or embarrassment. [ὅπερ εἰώθασι πολλάκις ποιεῖν οἱ μὴ θέλοντες ἀποκρίνεσθαι πρὸς τοὺς ἐρωτῶντας ἄκαιρα καὶ ἀνάξια, Euthymius.] Interesting passages are cited by Wetstein and Kypke, in one of which Euripides is cited as saying: τὴν σιωπὴν τοῖς σοφοῖς ἀπόκρισιν εἶναι.