Translation:

49. Said (Pharaoh): "Believe ye in him before I give you permission? Surely he is your leader who has taught you sorcery! But soon shall ye know! "But sure I will cut off your hands and your feet on opposite sides and I will cause you all to die on the cross!"

Notes (Tafseer)

3165. The sorcerers knew that they had met something very different from their tricks. Allah's power worked on them and they professed the True God. As they represented the intelligence of the community, it may be presumed that they carried the intelligence of Egypt with them and perhaps some of the commonalty, who were impressed by the dramatic scene! Hence Pharaoh's anger, but it is the beginning of his decline!