Chapter: 68: Verse: 10-13 - Enemy of Prophet Muhammad called 'illegitimate'

There are many narration which talk about the enemies of the AhlulBait (as) being, illegitimate. This fact is also found in verse of the Holy Quran and in the Tafseer of the verse. 

وَلَا تُطِعْ كُلَّ حَلَّافٍ مَّهِينٍ هَمَّازٍ مَّشَّاءٍ بِنَمِيمٍ  مَّنَّاعٍ لِّلْخَيْرِ مُعْتَدٍ أَثِيمٍ  عُتُلٍّ بَعْدَ ذَٰلِكَ زَنِيمٍ

"And yield not to any mean swearer [68:10] Defamer, going about with slander [68:11] For-bidder of good, out stepping the limits, sinful [68:12] Ignoble, besides all that, base-born (illegitimate) [68:13]"

و هو ما روي عن محمد بن جمهور عن حماد بن عيسى عن حسين بن مختار عنهم صلوات الله عليهم أجمعين في قوله عز و جل وَ لا تُطِعْ كُلَّ حَلَّافٍ مَهِينٍ الثاني هَمَّازٍ مَشَّاءٍ بِنَمِيمٍ مَنَّاعٍ لِلْخَيْرِ مُعْتَدٍ أَثِيمٍ عُتُلٍّ بَعْدَ ذلِكَ زَنِيمٍ قال العتل الكافر العظيم الكفر و الزنيم ولد الزناء

Narrated From Muhammad bin Majhoor, from Hammad bin Isa from Husain bin Mukhtar from Them (as):

Regarding the saying of Allah (swt), "And yield not to any mean swearer " [68:10]; (meaning) The second.

Defamer, going about with slander, For-bidder of good, out stepping the limits, sinful, Ignoble, besides all that, base-born (illegitimate) [68:11-13]; Imam (as)  said, 'Al-Utulu' is the disbeliever is great disbelieve. And 'Al-zaneem' is the illegitimate born.

[Source: Taaweel Al-Aayat, Vol.2, Pg. 712]

Chapter: 68, Verse 51-52

وروي عن حسان الجمال (2) قال: " حملت أبا عبد الله عليه السلام من المدينة إلى مكة فلما انتهينا إلى مسجد الغدير نظر في ميسرة المسجد فقال: ذاك موضع قدم رسول الله صلى الله عليه وآله حيث قال: " من كنت مولاه فعلي مولاه " ثم نظر إلى الجانب الآخر فقال: ذاك موضع فسطاط المنافقين وسالم مولى أبي حذيفة وأبي عبيدة بن الجراح، فلما رأوه رافعا يده قال بعضهم: انظروا إلى عينيه تدوران كأنهما عينا مجنون، فنزل جبرئيل عليه السلام بهذه الآية " وإن يكاد الذين كفروا ليزلقونك بأبصارهم لما سمعوا الذكر ويقولون إنه لمجنون وما هو إلا ذكر للعالمين.

Narrated from Hassan al-Jammal, who said:

"I carried Abu Abdullah Imam Sadiq (عليه السلام) from Medina to Mecca. When we reached the Mosque of Ghadir, he looked at the left side of the mosque and said, That is the spot where the Messenger of Allah (صلى الله عليه وآله) stood and said:

"Whomever I am his master, Ali is his master."

Then he looked to the other side and said, 'That is the spot of the tents of the hypocrites, including those of Salim, the freed slave of Abu Hudhayfah, and Abu Ubaydah ibn al-Jarrah. When they saw the Prophet raising hand of Imam Ali (ع), some of them said, "Look at his eyes—they are turning as if he is mad."

Then Jibril (as) descended with this verse: "Indeed, those who disbelieve almost make you slip with their glances when they hear the message, and they say, 'He is indeed mad.' But it is nothing except a reminder for the worlds." (68:51-52).'"

[Source: al-Faqih, Shaikh Saduq, Vol. 2, Pg. 559-560]