How was Philip’s testimony established in Samaria, Acts 8:5-6?

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Acts 8:5-6 NASB

Philip went down to the city of Samaria and began proclaiming the [d]Christ to them. 6 The crowds were paying attention with one mind to what was being said by Philip, as they heard and saw the [e]signs which he was performing.

According to Paul in the book of Corinthians two or more witnesses are needed which is also in keeping with the law in Deuteronomy.

2 Corinthians 13:1 NASB

This is the third time that I am coming to you. On the [a]testimony of two or three witnesses every matter shall be confirmed.

Deuteronomy 19:15 NASB

“A single witness shall not rise up against a person regarding any wrongdoing or any sin [r]that he commits; on the [s]testimony of two or three witnesses a matter shall be confirmed.

Even when Christ sent his disciples they went out in pairs so as to establish the word

Mark 6:7 NASB

And He *summoned the twelve and began to send them out in pairs, and gave them authority over the unclean spirits;

Unlike Paul who had many witnesses on his witnessing missionaries, Philip seems to have been alone in most of his missions

How was Philip’s testimony established?