John Gill Commentary Luke 6:7

"And the scribes and the Pharisees watched him, whether he would heal on the sabbath; that they might find how to accuse him." — Luke 6:7 (ASV)

And the Scribes and Pharisees watched him
(See Gill on Mark 3:2)

whether he would heal on the sabbath day :
there being such an object before him:

that they might find an accusation against him ;
as they had before against his disciples.