What miracle did the all the Apostles preform at Pentecost?

ANSWER

They spoke and everyone heard them in their native language

Acts 2 :

(5) Now there were staying in Jerusalem God-fearing Jews from every nation under heaven. (6) When they heard this sound, a crowd came together in bewilderment, because each one heard their own language being spoken. (7) Utterly amazed, they asked: “Aren’t all these who are speaking Galileans? (8) Then how is it that each of us hears them in our native language? (9) Parthians, Medes and Elamites; residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia, (10) Phrygia and Pamphylia, Egypt and the parts of Libya near Cyrene; visitors from Rome (11) (both Jews and converts to Judaism); Cretans and Arabs—we hear them declaring the wonders of God in our own tongues!” (12) Amazed and perplexed, they asked one another, “What does this mean?”
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