# no portion nor inheritance of land

The tribe of Levi did not receive a portion of the promised land when they arrived there. 

# Yahweh is his inheritance

"Yahweh is what they will have" or "Yahweh will allow them to serve him and he will provide for them through that service"

# Yahweh your God

Moses speaks to the Israelites as if they were one man, so the word "your" here is singular. 

# spoke to him

"spoke to the tribe of Levi"