I have heard that the Quran says that
a) It was Isaac sacrificed, whereas Muslims say it was Ishmael, and
b) That Muhammad was to go to the People of the Book to see whether this was a revelation of Allah or not.
Where are these verses?
b ) (Surat 10:94).
94 - so ,If thou wert in doubt as to what we have revealed unto thee, then ask those who have been reading the book from before thee: the truth hath indeed come to thee from thy Lord: so be in no wise of those in doubt.
nonmuslims usually separate this verse from the previous verses which talking about the story which talking about muasa (pbuh) and farouh
**75-Then after them We sent Musa (Moses) and Harun (Aaron) to Fir’aun (Pharaoh) and his chiefs with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.). But they behaved arrogantly and were Mujrimun (disbelievers, sinners, polytheists, criminals) folk.
76-So when came to them the truth from Us, they said: “This is indeed clear magic.”
77-Musa (Moses) said: “Say you (this) about the truth when it has come to you? Is this magic? But the magicians will never be successful.”
78-They said: “Have you come to us to turn us away from that (Faith) we found our fathers following, and that you two may have greatness in the land? We are not going to believe you two!”
79-And Fir’aun (Pharaoh) said: “Bring me every well-versed sorcerer.”
80-And when the sorcerers came, Musa (Moses) said to them: “Cast down what you want to cast!”
81-Then when they had cast down, Musa (Moses) said: "What you have brought is sorcery; Allah will surely make it of no effect. Verily, Allah does not set right the work of Al-Mufsidun (the evil-doers, corrupters).
82-“And Allah will establish and make apparent the truth by His Words, however much the Mujrimun (criminals, disbelievers, polytheists, sinners) may hate it.”
83-But none believed in Musa (Moses) except the offspring of his people, because of the fear of Fir’aun (Pharaoh) and his chiefs, lest they should persecute them; and verily, Fir’aun (Pharaoh) was an arrogant tyrant on the earth, he was indeed one of the Musrifun (polytheists, sinners and transgressors, those who give up the truth and follow the evil, and commit all kinds of great sins).
84-And Musa (Moses) said: “O my people! If you have believed in Allah, then put your trust in Him if you are Muslims (those who submit to Allah’s Will).”
85-They said: "In Allah we put our trust. Our Lord! Make us not a trial for the folk who are Zalimun (polytheists and wrong-doers) (i.e. do not make them overpower us).
86-“And save us by Your Mercy from the disbelieving folk.”
87-And We revealed to Musa (Moses) and his brother (saying): “Provide dwellings for your people in Egypt, and make your dwellings as places for your worship, and perform As-Salat (Iqamat-as-Salat ), and give glad tidings to the believers.”
88-And Musa (Moses) said: “Our Lord! You have indeed bestowed on Fir’aun (Pharaoh) and his chiefs splendour and wealth in the life of this world, our Lord! that they may lead men astray from Your Path. Our Lord! Destroy their wealth, and harden their hearts, so that they will not believe until they see the painful torment.”
89-Allah said: “Verily, the invocation of you both is accepted. So you both keep to the Straight Way (i.e. keep on doing good deeds and preaching Allah’s Message with patience), and follow not the path of those who know not (the truth i.e. to believe in the Oneness of Allah, and also to believe in the Reward of Allah: Paradise).”
90-And We took the Children of Israel across the sea, and Fir’aun (Pharaoh) with his hosts followed them in oppression and enmity, till when drowning overtook him, he said: “I believe that none has the right to be worshipped but He (Allah) in Whom the Children of Israel believe, and I am one of the Muslims (those who submit to Allah’s Will).”
91-Now (you believe) while you refused to believe before and you were one of the Mufsidun (evil-doers, the corrupters).
92-So this day We shall deliver your (dead) body (out from the sea) that you may be a sign to those who come after you! And verily, many among mankind are heedless of Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.).
93-And indeed We settled the Children of Israel in an honourable dwelling place (Sham and Misr), and provided them with good things, and they differed not until the knowledge came to them. Verily, Allah will judge between them on the Day of Resurrection in that in which they used to differ.
94-So if you are in doubt concerning that which We have revealed unto you, then ask those who are reading the Book [the Taurat (Torah) and the Injeel (Gospel)] before you]. Verily, the truth has come to you from your Lord. So be not of those who doubt (it).**