2 verses have
“once”
in Edition Clear Qur'an by Talal Itani / At-Tawba (The Repentance)
9:126Do they not see that they are tested once or twice every year? Yet they do not repent, and they do not learn.
9:128There has come to you a messenger from among yourselves, concerned over your suffering, anxious over you. Towards the believers, he is compassionate and merciful.
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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