«أَقْسَمَ بِاللَّهِ أَبُو حَفْصٍ عُمَرُ»
Abū Ḥafṣ ʿUmar swore by God.
«مَا مَسَّهَا مِنْ نَقَبٍ وَلَا دَبَرٍ»
It suffered neither a wound of the foot nor a wound of the back.
The first hemistich naturally raises the question: what was asserted under oath? The next supplies the content of that oath. The relation is one of an announced speech act and its explanation. The latter utterance therefore clarifies the first without needing coordination; the analysis concerns the connection between full clauses.