وَلَا يَجُوزُ الْمَسْحُ عَلَى خُفٍّ فِيهِ خَرْقٌ كَبِيرٌ يَتَبَيَّنُ مِنْهُ قَدْرُ ثَلَاثِ أَصَابِعِ الرِّجْلِ، وَإِنْ كَانَ أَقَلَّ مِنْ ذَلِكَ جَازَ.
Meaning: Wiping is not permitted on a khuff with an opening large enough to expose an area equal to three toes; if smaller, wiping remains permitted.
The threshold is measured by toes, not fingers of the hand. The legal concern is the extent of uncovered foot revealed by a tear.
Multiple tears in one khuff may be aggregated under the discussed rule, whereas openings in two separate khuffs are not combined as if they were one covering.