The Envy the Jews Feel Towards Muslims; Their Wicked Plots Against Muslims
Allah states that the Jews envy the faithful and wish they could misguide them. Allah states that the punishment of this behavior will fall back upon them, while they are unaware. Allah criticizes them,
(O People of the Scripture: Why do you mix truth with falsehood and conceal the truth while you know) by hiding what is in your Books about the description of Muhammad , while you know what you do.
The words in أَنتُمْ تَشْهَدُونَ (you are yourselves a witness - 70) and in أَنتُمْ تَعْلَمُونَ (you know ( 71) should not be taken to mean that disbelief will become permissible for them if they do not attest to the truth or have no knowledge about it. This is because kufr (disbelief) is intrinsically an abominable thing to practice. This is prohibited under all conditions. However, the mention of kufr (disbelief) after knowledge and attestation is to increase the impact of reproachment.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 66–70
The concept of monotheism is not only a basic teaching of the Prophet Muhammad but is also enshrined as an established reality, even in the interpolated versions of the Torah and the Bible. Judged on this established criterion, Islam, unlike Judaism and Christianity, is proved to be a perfectly true religion. Monotheism implies belief in only one God. He alone should be worshipped. No one should be associated with Him. No man should be accorded that special place which is the sole prerogative of the Lord of the Universe. This concept of monotheism is preserved in its pure form only in Islam in the Quran. Other religions, while accepting monotheism ideologically, also adopted almost everything that ran counter to it. While believing in God as the Sustainer, in practice they accorded that status to their saints.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.