A.T. Robertson Commentary Matthew 12:10

"and behold, a man having a withered hand. And they asked him, saying, Is it lawful to heal on the sabbath day? that they might accuse him." — Matthew 12:10 (ASV)

Is it lawful? (ε εξεστιν). The use of ε in direct questions is really elliptical and seems an imitation of the Hebrew (Robertson, Grammar, p. 916). See also Mt 19:3. It is not translated in English.