Jn 10:14-16, Heb 3:6-11,15, Heb 4:3-9
In the Old Testament, the psalmist told the Israelites not to harden their hearts but to listen to the word of God. (Psalms 95:7-11)
Psalms 95:7 For he is our God; and we are the people of his pasture, and the sheep of his hand. To day if ye will hear his voice, 8 Harden not your heart, as in the provocation, and as in the day of temptation in the wilderness: 9 When your fathers tempted me, proved me, and saw my work. 10 Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways: 11 Unto whom I sware in my wrath that they should not enter into my rest.
Those who harden their hearts and do not hear the voice of God cannot enter the rest of God. (Heb 3:6-11,15, Heb 4:3-9)
Heb 3:6 But Christ as a son over his own house; whose house are we, if we hold fast the confidence and the rejoicing of the hope firm unto the end. 7 Wherefore (as the Holy Ghost saith, To day if ye will hear his voice, 8 Harden not your hearts, as in the provocation, in the day of temptation in the wilderness: 9 When your fathers tempted me, proved me, and saw my works forty years. 10 Wherefore I was grieved with that generation, and said, They do alway err in their heart; and they have not known my ways. 11 So I sware in my wrath, They shall not enter into my rest.) 15 While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.
Heb 4:3 For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world. 4 For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works. 5 And in this place again, If they shall enter into my rest. 6 Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief: 7 Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts. 8 For if Jesus had given them rest, then would he not afterward have spoken of another day. 9 There remaineth therefore a rest to the people of God.
God's children hear the voice of Christ. (John 10:14-16)
John 10:14 I am the good shepherd, and know my sheep, and am known of mine. 15 As the Father knoweth me, even so know I the Father: and I lay down my life for the sheep. 16 And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd.