A.T. Robertson Commentary Luke 11:16

"And others, trying [him], sought of him a sign from heaven." — Luke 11:16 (ASV)

Tempting him (πειραζοντες). These "others" (ετερο) apparently realized the futility of the charge of being in league with Beelzebub. Hence they put up to Jesus the demand for "a sign from heaven" just as had been done in Galilee (Matthew 12:38). By "sign" (σημειον) they meant a great spectacular display of heavenly power such as they expected the Messiah to give and such as the devil suggested to Jesus on the pinnacle of the temple.

Sought (εζητουν). Imperfect active, kept on seeking.