because they set themselves against God and His Messenger: God is stern in His punishment of anyone who sets himself against Him.
این (جلاء وطن و آوارگی آنها) برای این بود که آنان با خدا و رسول او سخت دشمنی و مخالفت کردند و هر که با خدا (و رسولش) دشمنی آغازد عقاب خدا بسیار سخت است.