Guessing is mentioned in the Quran in these verses:

[6:116] If you obey the majority of people on earth, they will divert you from the path of God. They follow only conjecture; they only guess.

[6:148] The idol worshipers say, “Had God willed, we would not practice idolatry, nor would our parents, nor would we prohibit anything.” Thus did those before them disbelieve, until they incurred our retribution. Say, “Do you have any proven knowledge that you can show us? You follow nothing but conjecture; you only guess.”

[10:66] Absolutely, to God belongs everyone in the heavens and everyone on earth. Those who set up idols beside God are really following nothing. They only think that they are following something. They only guess.

[18:22] Some would say, “They were three; their dog being the fourth,” while others would say, “Five; the sixth being their dog,” as they guessed. Others said, “Seven,” and the eighth was their dog. Say, “My Lord is the best knower of their number.” Only a few knew the correct number. Therefore, do not argue with them; just go along with them. You need not consult anyone about this.

[34:53] They have rejected it in the past; they have decided instead to uphold conjecture and guesswork.

To learn more, read the Quran in English.

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