Al-Ahqaf 46:11

Waqala allatheena kafaroolillatheena amanoo law kana khayran masabaqoona ilayhi wa-ith lam yahtadoo bihifasayaqooloona hatha ifkun qadeem

And those who disbelieve say of those who believe, "If it had [truly] been good, they would not have preceded us to it." And when they are not guided by it, they will say, "This is an ancient falsehood."

The disbelievers say about the believers, “Had it (Islamic faith) been a good thing, these (weak and poor) people would not have preceded us (in proceeding) towards it.” Since they did not accept guidance through it (the Qur’ān), they will say, “This is a classical lie.”