2 verses have
“مستمر”
in Edition Simple Clean / Al-Qamar (The Moon)
2:54وإن يروا آية يعرضوا ويقولوا سحر مستمر
19:54إنا أرسلنا عليهم ريحا صرصرا في يوم نحس مستمر
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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