Remember, Lord, your great mercy and love, for they are from of old. (Ps 25:6 NIV)
Answer me, Lord, out of the goodness of your love; in your great mercy turn to me. (Ps 69:16)
And when He had looked around at them with anger, being grieved by the hardness of their hearts, He [Jesus] said to the man, “Stretch out your hand.” And he stretched it out, and his hand was restored. (Mk 3:5 NKJV)
Healing is a merciful act of God toward those who are ill. In the case of healing a woman of barrenness, in bible times, that was a removal of disgrace—a stigma attached to the woman. God is motivated to show mercy by His incomparable and unfailing love for us. Here are biblical examples of healings: Mt 9:27; 15:22; 17:15; 20:30; Mk 5:19; 10:47; Lk 1:58; 17:13; Phil 2:25-27.
Jesus has authorized us, His followers, to accept the same mission which He received from His Father God.
So Jesus said to them again, “Peace to you! As the Father has sent Me, I also send you.” (Jo 20:21)
So, we are to bring salvation and healing to the lost, the wounded, and the hurting. We can only do that by operating in the love of God and the mercy of God, even as Jesus did. This is the ministry to which all believers are called.