ἰδοὺ οἱ μαθηταί σου ποιοῦσιν ὃ οὐκ ἔξεστιν ποιεῖν (to do) ἐν σαββάτῳ.

ἰδοὺ οἱ μαθηταί σου ποιοῦσιν

ὃ οὐκ ἔξεστιν ποιεῖν (to do) ἐν σαββάτῳ.

Behold, your disciples are doing that which is not lawful to do on the Sabbath.