When the hypocrites come to you they say, "We bear witness that you are the messenger of God." God knows that you are His messenger, and God bears witness that the hypocrites are liars.
Translation endnotes
[63:1] Islam, which is peacemaking or peacefully surrendering to God, is the system followed by all righteous monotheists since Adam, and its basic principle is testimony to the absolute and sole authority of God. This testimony is mentioned and advocated in 3:18. As if God forgot a crucial part of the testimony, Sunnis have the audacity to add in the statement Muhammedun Rasulullah (Muhammed is God's Messenger). The Shiite faction went even a step further and added Ali Hujjatullah (Ali is God's Argument). This mentality of adding the names of idolized creatures next to God has been exposed by 39:45. Verse 63:1, is the only verse in the Quran that contains the second part of the shahada (testimony). As with the word hadith, sunna, ijma, and sharia (33:38; 35:43; 42:21; 45:6), God knew in advance that the polytheists would add the name of their idols next to His name. Thus, God mentioned the second part as the utterance of hypocrites. Modern hypocrites do not really believe that Muhammed was merely a messenger since they claim that he was a partner with God in authoring God's religion. They think that Muhammed completed where God had forgotten and that he even abrogated some of the Quranic verses. A messenger of God would never do such a thing, since their only mission is to deliver God's message. Thus, those who add a testimony about Muhammed's messengership in the shahada in fact are lying in that testimony; the Muhammed in their mind is no messenger, but rather their imaginary god besides God.