David
Psalm 95:8ESV·traditional attribution

do not harden your hearts, as at Meribah, as on the day at Massah in the wilderness,

John Calvin Reformed @genevareformer

PSALM 95 The inspired penman of this psalm, whoever he was, This psalm has no inscription, but the Septuagint, Vulgate, Æthiopic, Arabic, and Syriac versions, and the apostle Paul in Hebrews 4:7, ascribe it to David; so that there can be no doubt that it is one of the compositions of the sweet singer of Israel.

Commenting on Psalm 95:1-11

C.H. Spurgeon Reformed Baptist @princeofpreachers

Harden not your heart. If ye will hear, learn to fear also. The sea and the land obey him, do not prove more obstinate than they! We cannot soften our hearts, but we can harden them, and the consequences will be fatal. Today is too good a day to be profaned by the hardening of our hearts against our own mercies. While mercy reigns let not obduracy rebel.

Matthew Henry Presbyterian @wholebiblehenry

The latter part of this psalm, which begins in the middle of a verse, is an exhortation to those who sing gospel psalms to live gospel lives, and to hear the voice of God's word; otherwise, how can they expect that he should hear the voice of their prayers and praises? Observe, I.

Commenting on Psalm 95:7-11