Whether you seek forgiveness for them, or do not seek forgiveness for them. If you seek forgiveness for them seventy times, God will not forgive them. That is because they have rejected God and His messenger; and God does not guide the wicked people.
Translation endnotes
[9:80] How can Muhammed intercede on behalf of complete strangers while he could not even intercede on behalf of his uncles and his closest relatives? Abraham could not intercede on behalf of his own father (60:4), Noah could not save his own son (11:46). Also, see 2:48.