Christs Death obtained Salvation for them He died for, His Body the Church. 1 Thess 5:9-10
9 For God hath not appointed us to wrath, but to obtain salvation by our Lord Jesus Christ,
10 Who died for us, that, whether we wake or sleep, we should live together with him.
Please notice in this passage of Holy Scripture, in contrast to them whom God has appointed to wrath, these have been granted to obtain Salvation by means of the Lord Jesus Christ who died for them.
This obtaining Salvation denotes not a mere possibility of Salvation, but the application of Salvation, everything done unto them for the saving of the soul, full Salvation, which begins in this life, culminating but not ending into final everlasting glory,
17 But Israel shall be saved in the Lord[Jesus Christ] with an everlasting salvation: ye shall not be ashamed nor confounded world without end.
This is foundationed on and resultive of Christ dying for them !