Matthew 12:38

38 Then some of the scribes and Pharisees answered and said to Him, “Teacher, ^awe want to see ¹a sign from You.”

Matthew 16:1

^aAnd the ^bPharisees and Sadducees came, and testing Him, they ^casked Him to show them ¹a sign from heaven.

18 ^aThe Jews then said to Him, “^bWhat sign do You show us ¹as your authority for doing these things?”