In Beresheet 20:7 it says:
"וְעַתָּה הָשֵׁב אֵשֶׁת הָאִישׁ כִּי נָבִיא הוּא וְיִתְפַּלֵּל בַּעַדְךָ וֶחְיֵה וְאִם אֵינְךָ מֵשִׁיב דַּע כִּי מוֹת תָּמוּת אַתָּה וְכָל אֲשֶׁר לָךְ"
"Therefore, restore the man’s wife—since he is a prophet, he will intercede for you—to save your life. If you fail to restore her, know that you shall die, you and all that are yours.”"
Why is it necessary to state that Avraham is a prophet?
Edit: It was suggested by @TamirEvan and @rosends per the Radak that this was because the prophet is closer to Hashem than the non-prophet. If that's the case, then why not simply state that "since he is close to me, he will intercede for you"?
@rosends and @Shlomy brought Rashi's view that as a prophet, Avraham would know that Avimelech didn't touch Sarah, and would then be willing to pray for him. If that's the case, then why not simply state that "since he knows you did not touch her, he will intercede for you"?
In short, it seems to me there is some other meaning specific to the role of a prophet in this context. I am wondering what that is.