2 verses have
“fast”
in Edition Clear Qur'an by Talal Itani / Al-A'raaf (The Heights)
7:145And We inscribed for him in the Tablets all kinds of enlightenments, and decisive explanation of all things. “Hold fast to them, and exhort your people to adopt the best of them. I will show you the fate of the sinners.”
7:171And when We suspended the mountain over them, as if it was an umbrella, and they thought it would fall on them: “Hold fast to what We have given you, and remember what it contains, so that you may be saved.”
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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