Greetings, charity, and the Hereafter

What links «بِسَلَامٍ» with the earlier command «السَّلَامَ»?

Greetings, Family Ties, Charity, and Preparation for the Hereafter (Accounts 6–8)

• Both specify a time
• Both discuss money
• Both identify a travel destination
• Peace is spread at the start and promised at the end