1 verse has
“fifty”
in Edition Clear Qur'an by Talal Itani / Al-Ma'aarij (The Ascending Stairways)
70:4Unto Him the angels and the Spirit ascend on a Day the duration of which is fifty thousand years.
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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