2 verses have
“observe”
in Edition Clear Qur'an by Talal Itani / Luqman (Luqman)
31:4Those who observe the prayer, and pay the obligatory charity, and are certain of the Hereafter.
31:17O my son, observe the prayer, advocate righteousness, forbid evil, and be patient over what has befallen you. These are of the most honorable traits.
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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