1 verse has
“ketekunan”
in Edition Unknown / Al-Muzzammil (The Enshrouded One)
73:8Sebutlah nama Tuhanmu, dan beribadatlah kepada-Nya dengan penuh ketekunan.
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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