Good News Translation
If he becomes so bitter that he does curse you, his Creator will hear his prayer.

New Revised Standard Version
for if in bitterness of soul some should curse you, their Creator will hear their prayer.

Contemporary English Version
And if their curses flow from hearts you made bitter, God, the Creator, will hear them and do what they ask.

New American Bible
If in their pain they cry out bitterly, their Rock will hear the sound of their cry.

Douay-Rheims Bible
For the prayer of him that curseth thee in the bitterness of his soul, shall be heard, for he that made him will hear him.

For the prayer of him that curseth thee in the bitterness of his soul, shall be heard, for he that made him will hear him.

Sirach 4:4
Reject not the petition of the afflicted: and turn not away thy face from the needy.

Sirach 4:5
Turn not away thy eyes from the poor for fear of anger: and leave not to them that ask of thee to curse thee behind thy back.

Sirach 4:7
Make thyself affable to the congregation of the poor, and humble thy soul to the ancient, and bow thy head to a great man.

Sirach 4:8
Bow down thy ear cheerfully to the poor, and pay what thou owest, and answer him peaceable words with mildness.