4:28-30 Why were the Jews filled with wrath against Jesus and trying to kill him here?

(cp also Lk 4:18-27). While the Jews marvelled at what Jesus had to say about God's grace in Isaiah's prophecy, they were offended and stung to fury, and tried to kill Him for first claiming Messiahship and then declaring that God's grace would be withheld from the Jews and extended to the Gentiles because of the Jews' rejection of Him.

The widow of Sarepta and Naaman were Gentiles. The Jews would never accept Jesus as the long-awaited Messiah from God because He had grown up in their midst. They had known Him from childhood and saw Him only as the "carpenter's son" (cp Mt 13:54-58; Mk 6:1-6; Jn 6:32-36, 41-43, 60-66; Ac 2:22-23).