'Day of Salvation' in the Bible

This is the word of the Lord: I have given ear to you at a good time, and I have been your helper in a day of salvation: and I will keep you safe, and will make you a glory for the people, putting the land in order, and giving them the heritages which now are waste;

(For he says, I have given ear to you at a good time, and I have been your helper in a day of salvation: see, now is the good time; now is the day of salvation):

And do not give grief to the Holy Spirit of God, by whom you were marked for the day of salvation.