1 verse has
“firmer”
in Edition Clear Qur'an by Talal Itani / An-Nisaa (The Women)
4:66Had We decreed for them: “Kill yourselves,” or “Leave your homes,” they would not have done it, except for a few of them. But had they done what they were instructed to do, it would have been better for them, and a firmer confirmation.
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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