1 verse has
“schlüpfrigem”
in Edition A. S. F. Bubenheim and N. Elyas / Al-Kahf (The Cave)
18:40so wird mein Herr mir vielleicht etwas Besseres als deinen Garten geben und über ihn aufeinanderfolgende Strafe vom Himmel senden, so daß er zu schlüpfrigem Erdboden wird,
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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