A poet encapsulates:

سفرين سنها له ولقومه سفر الشتاء ورحلة الاصياف

“Haashim initiated two journeys for himself and his people, a journey in winter and another in summer.”

Haashim secured assurances of extensive protection from the Yemeni as well as the Roman governments for his trade caravans. Since the trade routes of Arabia were not safe from robbers, Haashim formed a pact with all the various tribes of the peninsula assuring them that we (the Makkans) would freely transport your basic necessities to you, whilst you in turn should pledge safe passage to all our caravans passing through your tribal lands. As a result of Haashim’s brilliant strategy, all the trade routes leading to and from Makkah became safe.

Allah Ta’ala also draws the attention of the Quraish to this bounty in the following words:

لِاِیۡلٰفِ قُرَیۡشٍ ۙ﴿۱﴾ اٖلٰفِہِمۡ رِحۡلَۃَ الشِّتَآءِ وَ الصَّیۡفِ ۚ﴿۲﴾ فَلۡیَعۡبُدُوۡا رَبَّ ہٰذَا الۡبَیۡتِ ۙ﴿۳﴾ الَّذِیۡۤ اَطۡعَمَہُمۡ مِّنۡ جُوۡعٍ ۬ۙ وَّ اٰمَنَہُمۡ مِّنۡ خَوۡفٍ ٪﴿۴﴾ 

“(With the grace of Allah) Due to the habituated custom of the Quraish, their habitual custom of setting forth in winter and summer, (as a form of gratitude), they should worship Allah, the Lord of this house, He who has fed them against hunger and shielded them from fear.” (Surah Quraish)

(Extracted from Seeratul Mustafa 1/31)