So if they believe in the same as you believe in, then they have been [rightly] guided; but if they turn away, they are only in dissension, and Allāh will be sufficient for you against them. And He is the Hearing, the Knowing.
Verse 137 of Surah Al-Baqarah (2:137), a Medinan surah, is in juz 1, on page 21 of the mushaf. Read it in Arabic with its transliteration, translations and tafsir, and listen to it recited by 69 reciters.
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Tafsir of verse 137
Al-Mukhtasar
If the Jews and the Christians, and other disbelievers, have faith in the same way that you do, then they have been guided to the right way of life which Allah is satisfied with. Yet if they turn away from faith because they reject all the prophets or some of them, then they are in disagreement and are against you. Do not be sad, O Prophet, because Allah will protect you from their harm and evil, and give you victory over them. Allah hears all that they say, and knows all their intentions and actions.
If they believe as you have believed, then they are guided. But if they turn away, then they are in plain dissension. Allah will suffice you against them, and He is the All-Hearing, the All-Knowing.
So if they believe in the like of that which you believe, then they are rightly guided; but if they turn away, then they are only in opposition. So Allâh will suffice you against them. And He is the All-Hearer, the All-Knower.
And if they believe in the like of that which ye believe, then are they rightly guided. But if they turn away, then are they in schism, and Allah will suffice thee (for defence) against them. He is the Hearer, the Knower.
So if they believe as ye believe, they are indeed on the right path; but if they turn back, it is they who are in schism; but Allah will suffice thee as against them, and He is the All-Hearing, the All-Knowing.
If then they believe as you believe in Him, they are indeed on the right course, and if they turn back, then they are only in great opposition, so Allah will suffice you against them, and He is the Hearing, the Knowing.
So, in case they believe in the like of whatever you have believed in, then they are readily guided; and in case they turn away, then surely they are only in opposition; so Allah will soon suffice you for them; and He is The Ever-Hearing, The Ever-Knowing.
So direct your face [i.e., self] toward the religion, inclining to truth. [Adhere to] the fiṭrah of Allāh upon which He has created [all] people. No change should there be in the creation of Allāh. That is the correct religion, but most of the people do not know.
Worship Allāh and associate nothing with Him, and to parents do good, and to relatives, orphans, the needy, the near neighbor, the neighbor farther away, the companion at your side, the traveler, and those whom your right hands possess. Indeed, Allāh does not like those who are self-deluding and boastful,
Verses with similar wording
They share a sequence of words with this verse: useful for telling them apart when memorising.
So if they argue with you, say, "I have submitted myself to Allāh [in Islām], and [so have] those who follow me." And say to those who were given the Scripture and [to] the unlearned, "Have you submitted yourselves?" And if they submit [in Islām], they are rightly guided; but if they turn away - then upon you is only the [duty of] notification. And Allāh is Seeing of [His] servants.