وَقَبْرُ حَرْبٍ بِمَكَانٍ قَفْرٍ، وَلَيْسَ قُرْبَ قَبْرِ حَرْبٍ قَبْرُ
Harb’s grave stands in a deserted place, and there is no other grave close to Harb’s grave.
The sound patterns of qabr, harb, qurb recur in close succession. Each is an ordinary Arabic word in isolation, but the assembled sequence is famously cumbersome to pronounce.
The meaning is recoverable and the syntax can be understood. Neither property removes the phonetic heaviness created by the whole utterance.