Romans 2:28 - 29, Gospel
[For] he is not a Jew, who is one outwardly; neither [is] circumcision [that] which is outward in the flesh. But he [is] a Jew, who is one inwardly; and circumcision [is] of the heart, in the spirit, [and] not in the letter; whose praise [is] not of men, but of God.
Mark 7:7, Gospel
[For] they serve Me in vain, teaching the commandments of men [for] doctrines."
Deuteronomy 6:5 - 7, Torah
[For the Lord your God said,] "You will love the Lord your God with all your heart, and with all your soul, and with all your might. And these words, which I command you this day, will be in your heart. And you will teach them diligently to your children, and will talk of them when you sit in your house, and when you walk by the way, and when you lie down, and when you rise up."
20:25, Qur'an
[For Moses] said, "My Lord, open [circumcise] my heart for me [to love You]."
94:1, Qur'an
[And thus,] did We not open [circumcise] your heart for you [to love God]?
Jeremiah 9:25 - 26, Torah
[So] behold, the days come," the Lord says, "That I will punish all [those who are] circumcised only as to the foreskin [of the flesh]; Egypt, and Judah, and Edom, and the children of Ammon, and Moab, and all [who are] in the utmost corners, who dwell in the wilderness, for all [these] nations [are] uncircumcised [in the heart], and all the house of Israel [are also] uncircumcised in the heart.
Jeremiah 4:4 - 6, Torah
[So] circumcise [open] yourselves to the Lord, and take away the foreskins of your heart, you men of Judah and inhabitants of Jerusalem, unless My fury comes forth like fire, and burns so that none can quench [it], because of the evil of your doings. Declare in Judah, and publish in Jerusalem; and say, 'Blow the trumpet in the land, cry, gather together,' and say, 'Assemble yourselves, and let us go into the defensed cities.' Set up the standard toward Zion, retire, do not stay, for I will bring evil from the north, and a great destruction.
22:45 - 46, Qur'an
And [so] how many cities did We destroy while they were committing wrong - so they are [now] fallen into ruin - and [how many] abandoned wells and [how many] lofty palaces? So have they not traveled through the earth and have hearts by which to reason and ears by which to hear? For indeed, it is not eyes that are blinded, but the hearts are blinded which are within the chests.
[Epistle of Barnabas 9:3], Gospel
The circumcision in which they have confidence is abolished; for He has said that a circumcision [of the heart], not of the flesh, should be practiced. But they transgressed, for an evil angel taught them cleverness, [but the angel did not teach anyone unless he said, "I am a trial, so do not disbelieve." But the devils disbelieved, teaching people that which was sent down to the angel.]
[And] Abu Huraira [narrated in the Hadiths]:
Allah's Messenger (ﷺ) said "The Prophet) Abraham circumcised himself after he had passed the age of eighty years and he circumcised himself with an adze." - Sahih al-Bukhari
22:53 - 54, Qur'an
[That is] so He may make what [falsehood] Satan throws in a trial for those who have disease in their hearts and those hard of heart. And indeed, the wrongdoers are in extreme dissension. And so those who were given knowledge may know that it is the truth from your Lord and [therefore] believe in it, and their hearts become humble to it. And indeed God is the Guide of those who have believed to a straight path -