Al-Anfal 8:72

Inna allatheena amanoo wahajaroowajahadoo bi-amwalihim waanfusihim fee sabeeli Allahiwallatheena awaw wanasaroo ola-ikabaAAduhum awliyao baAAdin wallatheenaamanoo walam yuhajiroo ma lakum min walayatihimmin shay-in hatta yuhajiroo wa-ini istansarookumfee addeeni faAAalaykumu annasru illaAAala qawmin baynakum wabaynahum meethaqun wallahubima taAAmaloona baseer

Indeed, those who have believed and emigrated and fought with their wealth and lives in the cause of Allāh and those who gave shelter and aided - they are allies of one another. But those who believed and did not emigrate - for you there is no support of them until they emigrate. And if they seek help of you for the religion, then you must help, except against a people between yourselves and whom is a treaty. And Allāh is Seeing of what you do.

Surely those who believed and emigrated and carried out Jihād in the way of Allah with their wealth and lives, and those who gave refuge and help (to the emigrants), both are close friends to each other. And those who believed and did not emigrate, you have no friendship with them at all, unless they emigrate. However, if they seek your help in the matter of faith, then, you are bound to help, except against a people with whom you have a treaty. Allah is watchful over what you do.