Who are the Sabeans in the Koran? Wikipedia has a huge discussion on who they are. The Koran simply assumes the listener knows who they are:
Indeed, those who believed and those who were Jews or Christians or Sabeans [before Prophet Muḥammad] – those [among them] who believed in Allāh and the Last Day and did righteousness – will have their reward with their Lord, and no fear will there be concerning them, nor will they grieve.
Koran 2:62
Indeed, those who have believed [in Prophet Muḥammad] and those [before him] who were Jews or Sabeans or Christians – those [among them] who believed in Allāh and the Last Day and did righteousness – no fear will there be concerning them, nor will they grieve.
Koran 5:69
Indeed, those who have believed and those who were Jews and the Sabeans and the Christians and the Magians and those who associated with Allāh – Allāh will judge between them on the Day of Resurrection.
Indeed Allāh is, over all things, Witness.
Koran 22:17
Naturally, Muhammad’s context is not ours, showing that these verses come from Muhammad, not from Allah, so showing Allah, Islam, Muhammad and the Koran are all false.
Koran – Abraham a Sabean?
6:75 And thus did We show Abraham the realm of the heavens and the earth that he would be among the certain [in faith]
76 So when the night covered him [with darkness], he saw a star. He said, “This is my lord.” But when it set, he said, “I like not those that disappear.”
77 And when he saw the moon rising, he said, “This is my lord.” But when it set, he said, “Unless my Lord guides me, I will surely be among the people gone astray.”
78 And when he saw the sun rising, he said, “This is my lord; this is greater.” But when it set, he said, “O my people, indeed I am free from what you associate with Allah.
79 Indeed, I have turned my face toward He who created the heavens and the earth, inclining toward truth, and I am not of those who associate others with Allah.
Koran 6:75-79
Of course, Abraham was not a “Sabi” or a “Sabean”. Instead, Muhammad probably mangled Genesis 15:5, where GOD speaks to Abraham about his offspring:
He took him outside and said, “Look up at the sky and count the stars—if indeed you can count them.”
Then he said to him, “So shall your offspring be.”
NIV Genesis 15:5
Hadith – Sabi
There are several long hadiths about the “Sabi” and Muhammad is called a “Sabi”. The impression I get from the hadith is that “Sabi” means “convert”? Are these “Sabi” the “Sabeans” mentioned in the Koran? I have no idea.
Conclusion
Muhammad presumes his context upon the listener (and reader), repeats himself three times about these people, contradicting the oneness of Allah, showing Allah is none, an idol, so Muhammad is a false prophet for a false religion, Islam.
Koran Contradiction 