2 verses have
“knew”
in Edition Clear Qur'an by Talal Itani / An-Nahl (The Bee)
16:41Those who emigrate for God’s sake after being persecuted, We will settle them in a good place in this world; but the reward of the Hereafter is greater, if they only knew.
16:95And do not exchange God’s covenant for a small price. What is with God is better for you, if you only knew.
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Those who spend their wealth by night and day, privately and publicly, will receive their reward from their Lord. They have nothing to fear, nor shall they grieve.
The Holy Quran · Al-Baqara (The Cow) · 2:274