3:19 return to the ground. I.e., to die (cf. 2:7). Man, by sin, became mortal. Although he did not die the moment he ate (by God’s mercy), he was changed immediately and became liable to all the sufferings and miseries of life, to death, and to the pains of hell forever. Adam lived 930 years (5:5).
MacArthur Study Bible
3:19 Further, the man’s body will return to the ground (v. 19), i.e., it will die (which was not true of the original created order; cf. Rom. 5:12). For this reason, the Bible looks forward to a time when nature will be set free from the consequences of human sin; i.e., nature will no longer be the arena of punishment, and it will finally have glorified human beings to manage it and bring out its full potential (Rom. 8:19–22).
ESV Study Bible