Deuteronomy 32:3-4

Deuteronomy 32:3-4

[3] Because I will publish  the name  of the LORD:  ascribe  ye greatness  unto our God.  [4] He is the Rock,  his work  is perfect:  for all his ways  are judgment:  a God  of truth  and without iniquity,  just  and right 

What is the context of Deuteronomy 32:3-4?