Seek the LORD while He may be found; Call upon Him while He is near. Let the wicked forsake his way And the unrighteous man his thoughts; And let him return to the LORD, And He will have compassion on him, And to our God, For He will abundantly pardon. (Isaiah 55:6-7)

Here is one of the clearest OT invitations to salvation now and kingdom blessing later. It gives an excellent example of how people were saved during the OT period. Salvation grace and mercy were available to the soul that was willing to 1) seek the Lord and 2) call on him while he is still available. Such true seeking in faith is accompanied by repentance, which is described as forsaking ways and thoughts and turning from sinful living to the Lord. A sinner must come, believing in God, recognizing his sin and desiring forgiveness and deliverance from that sin. At the same time he must recognize his own inability to be righteous or to satisfy God and cast himself on God’s mercy. It is then that he receives a complete pardon. His sin has been covered by the substitution of the Messiah in his place. (John MacArthur)

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We have here a further account of that covenant of grace which is made with us in Jesus Christ, both what is required and what is promised in the covenant, and of those considerations that are sufficient abundantly to confirm our believing compliance with and reliance on that covenant. (Matthew Henry)