3 verses have
“which”
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.
70:42So leave them to blunder and play, until they meet their Day which they are promised.
70:44Their eyes cast down; overwhelmed by humiliation. This is the Day which they were promised.
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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