Seventy is mentioned in the Quran in these verses:

[7:155] Moses then selected seventy men from among his people, to come to our appointed audience. When the quake shook them, he said, “My Lord, You could have annihilated them in the past, together with me, if You so willed. Would You annihilate us for the deeds of those among us who are foolish? This must be the test that You have instituted for us. With it, You condemn whomever You will, and guide whomever You will. You are our Lord and Master, so forgive us, shower us with Your mercy; You are the best Forgiver.

[9:80] Whether you ask forgiveness for them, or do not ask forgiveness for them – even if you ask forgiveness for them seventy times – God will not forgive them. This is because they disbelieve in God and His messenger. God does not guide the wicked people.

[69:30] Take him and shackle him.

[69:31] Burn him in Hell.

[69:32] In a chain that is seventy arms long, tie him up.

[69:33] For he did not believe in God, Most Great.

[69:34] Nor did he advocate the feeding of the poor.

[69:35] Consequently, he has no friend here.

[69:36] Nor any food, except the bitter variety.

[69:37] Food for the sinners.

To learn more, read the Quran in English.

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