1 verse has
“festeste”
in Edition A. S. F. Bubenheim and N. Elyas / Luqman (Luqman)
31:22Wer sich Allah völlig hingibt und dabei Gutes tut, der hält sich an die festeste Handhabe. Und zu Allah (führt) das Ende der Angelegenheiten.
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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