Mark 6:49-50

But when they saw him walking on the lake, they thought he was a ghost. They cried out, because they all saw him and were terrified. Immediately he spoke to them and said, “Take courage! It is I. Don’t be afraid.”

Mark 13:11

Whenever you are arrested and brought to trial, do not worry beforehand about what to say. Just say whatever is given you at the time, for it is not you speaking, but the Holy Spirit.