لِإِيلَافِ قُرَيْشٍ إِيلَافِهِمْ رِحْلَةَ الشِّتَاءِ وَالصَّيْفِ
For Quraysh’s accustomed security—their accustomed winter and summer journeys. (106:1–2)
The repeated īlāf is not pointless redundancy. Quraysh is named, then referred to by -him, and the actual travel cycle is specified. The second phrase may be analyzed as an explanatory substitute for the first.
Repetition restores attention and narrows a general favor to identifiable journeys. In one familiar grammatical treatment, the accusative riḥlata relates to the preceding verbal noun; it is not automatically an adverb of time.