Read Psalm 40:6 Using Other Translations
Sacrifice and offering thou didst not desire; mine ears hast thou opened: burnt offering and sin offering hast thou not required.
In sacrifice and offering you have not delighted, but you have given me an open ear. Burnt offering and sin offering you have not required.
You take no delight in sacrifices or offerings. Now that you have made me listen, I finally understand — you don’t require burnt offerings or sin offerings.