﴿ يَعِظُكُمُ ٱللَّهُ أَن تَعُودُوا۟ لِمِثْلِهِۦٓ أَبَدًا إِن كُنتُم مُّؤْمِنِينَ ﴾

“God admonishes you [hereby] lest you ever revert to the like of this [sin], if you are [truly] believers;”

God admonishes you He forbids you lest you should ever repeat the like of it if you are in truth believers then you will be admonished by this.