Psalm 146:3 son of man?
Psalm 146:3 (NASB) Advises: Do not trust in princes, In mortal man, in whom there is no salvation.
In the Hebrew Scriptures, the most frequent occurrence of the expression is in the book of Ezekiel, where over 90 times God addresses the prophet as “son of man.” (Ezekiel 2:1, 3, 6, 8) The designation as so used apparently serves to emphasize that the prophet is simply an earthling, thus heightening the contrast between the human spokesman and the Source of his message, the Most High God. The same designation is applied to the prophet Daniel at ,
Daniel 8:17 (NASB)
17 So he came near to where I was standing, and when he came I was
frightened and fell on my face; but he said to me, “Son of man",
understand that the vision pertains to the time of the end.”
Jesus’ application of this expression to himself clearly showed that God’s Son was now indeed a human, having ‘become flesh’ (John 1:14), having ‘come to be out of a woman’ through his conception and birth to the Jewish virgin Mary. (Galatians 4:4; Luke 1:34-36) Hence he had not simply materialized a human body as angels had previously done; he was not an incarnation but was actually a ‘son of mankind’ through his human mother
Both expressions "son of man" or "mortal man" are correct,