A soft answer turneth away wrath;
but grievous words stir up anger.
Proverbs 15:1

...Wherefore, my brethren,
let every man be swift to hear,
slow to speak, slow to wrath;
for the wrath of man
worketh not the righteousness of God.

James 1:19 & 20

...Be ye therefore merciful as your Father is also merciful.
Judge not, and ye shall not be judged: condemn not,
and ye shall not be condemned:
forgive, and ye shall be forgiven...

Luke 6:36 & 37

Give, and it shall be given unto you;
good measure, pressed down, and shaken together,
and running over, shall men give unto your bosom. 
For with the same measure ye mete withal
it shall be measured to you again.

Luke 6:38

The merciful man doeth good to his own soul:
but he that is cruel troubleth his own flesh.

Proverbs 11:17

But after that the kindness and love of God our Savior toward man appeared,
Not by works of righteousness which we have done,
but according to His mercy He saved us,
by the washing of regeneration,
and renewing of the Holy Ghost;
Which He shed on us abundantly
through Jesus Christ our Savior.
Titus 3:4-6

...Let the little children come unto Me, and do not
forbid them; for of such is the kingdom of God...

Luke 18:16

...the servant of the Lord must not strive;
but be gentle unto all men, apt to teach, patient,
In meekness instructing those that oppose themselves;
if God peradventure will give them repentance
to the acknowledging of the truth;
And that they may recover themselves
out of the snare of the devil,
who are taken captive of him at his will.

2 Timothy 2:24-26

Thou hast also given me the shield of thy salvation:
and thy right hand hath holden me up,
and thy gentleness hath made me great.

Psalm 18:35

...Let all bitterness, and wrath, and anger, and clamour,
and evil speaking be put away from you, with all malice:
And be ye kind to one another,
tenderhearted, forgiving one another,
even as God for Christ's sake hath forgiven you.

Ephsians 4:31 & 32

shall feed His flock like a shepherd;
He shall gather the lambs with His arm,
and carry them in His bosom,
and shall gently lead those who are with young.

Isaiah 40:11

...Therefore, as the elect of God, holy and beloved,
put on tender mercies, kindness, humbleness of mind, meekness, longsuffering;
Bearing with one another, and forgiving one another,
if anyone has a complaint against another;
even as Christ forgave you, so you must also do.

Colossians 3:12 & 13