Matt 5:23-24

Reconcile before worship.

The obvious impact of this passage is to tell people that their worship may be ineffective. A person cannot come to God and through his worship say that he loves God if their is anger, bitterness, and resentment in his heart towards his neighbor. We love God through keeping his commandments.

1John 5:2-3 "This is how we know that we love the children of God: by loving God and carrying out his commands. This is love for God: to obey his commands..."
Luke 10:27 " 'Love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind'[ 10:27 Deut. 6:5] ; and, 'Love your neighbor as yourself.'[ 10:27 Lev. 19:18] "
See passages on love one another.
 

Worship with hardness of heart would be very much like the Pharasees whom the Lord accused of hypocrisy. Matt. 23:27-28.

Eph. 4:20-27 NRSV "That is not the way you learned Christ! For surely you have heard about him and were taught in him, as truth is in Jesus. You were taught to put away your former way of life, your old self, corrupt and deluded by its lusts, and to be renewed in the spirit of your minds, and to clothe yourselves with the new self, created according to the likeness of God in true righteousness and holiness. So then, putting away falsehood, let all of us speak the truth to our neighbors, for we are members of one another. Be angry but do not sin; do not let the sun go down on your anger, and do not make room for the devil. " Compare the NAB.