Yunus 10:103

Thumma nunajjee rusulana wallatheenaamanoo kathalika haqqan AAalaynanunjee almu/mineen

Then We will save Our messengers and those who have believed. Thus, it is an obligation upon Us that We save the believers.

Then We (used to) save Our messengers and those who believed. Similarly, it being undertaken by Us, We shall save the believers.