The growing interest in diaspora mission requires consideration of the pertinent biblical material. This essay focuses on two parts of the Old Testament: the patriarchal narratives of Genesis and Israel's Law. The former introduces the reader to migrant experiences of the people of God and then connects these to their call to be a blessing to all the earth. The latter contends that Old Testament Law can serve as a paradigm for diaspora mission today in the form of tangible initiatives on behalf of diaspora peoples, both within the Christian community and beyond. The growing interest in diaspora mission requires consideration of the pertinent biblical material. This essay focuses on two parts of the Old Testament: the patriarchal narratives of Genesis and Israel's Law. The former introduces the reader to migrant experiences of the people of God and then connects these to their call to be a blessing to all the earth. The latter contends that Old Testament Law can serve as a paradigm for diaspora mission today in the form of tangible initiatives on behalf of diaspora peoples, both within the Christian community and beyond.