I will offer unto thee burnt sacrifices of fatlings
 Of the fattest of the flock; that is, of the best; such as Abel offered, ( Genesis 4:4 ) ; 
 with the incense of rams;
 or "rams with incense" F6; the Targum is, 
``with sweet incense, the sacrifice of rams;''Kimchi interprets it of incense of the fat of rams.
 I will offer bullocks with goats;
 he proposed to offer all kind of offerings, to show gratitude and thankfulness for the favours received; by all which are meant the calves, or fruit of the lips, the sacrifices of praise, thanksgiving to God, in the name of the whole church and people of God; see (  Revelation 19:1-7 ) . 
Selah; on this word, (See Gill on Psalms 3:2).