Isaiah
Isaiah 55:6BSB·traditional attribution

Seek the LORD while He may be found; call on Him while He is near.

Matthew Henry Presbyterian @wholebiblehenry

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.

Commenting on Isaiah 55:6-13

John Gill Reformed Baptist @doctorgill

Seek ye the Lord while he may be found,.... The Lord is to be sought unto at all times, whenever the people of God meet together, especially on sabbath days, and while the external ministry of the word lasts, and life itself; so the Targum, "seek the fear of the Lord, while ye are alive.'' Kimchi compares it with Ecc 9:10.

Jamieson-Fausset-Brown Reformed @jfbcommentary

The condition and limit in the obtaining of the spiritual benefits (Isa 55:1-3): (1) Seek the Lord. (2) Seek Him while He is to be found (Isa 65:1; Psa 32:6; Mat 25:1-13; Joh 7:34; Joh 8:21; Co2 6:2; Heb 2:3; Heb 3:13, Heb 3:15). call--casting yourselves wholly on His mercy (Rom 10:13). Stronger than "seek"; so "near" is more positive than "while He may be found" (Rom 10:8-9).