Friends:

Not Killing, promoting Harmlessness, & Praising Good-Will!

Once in Savatthi the Blessed Buddha said this:
What, householder friends, is the Dhamma explanation befitting to oneself?
Here, householder friends, a Noble Disciple reflects thus: I am one who wishes
to live, who does not wish to die; I desire happiness & do not like any suffering.
If someone were to take my life, it would neither be pleasing nor agreeable to me.
If I kill whatever another being: One who also wishes to live, who also does not
wish to die, who also desires happiness & who also dislike suffering, that would
neither be pleasant nor acceptable to that other being either...
What is displeasing and disagreeable to me, is also displeasing and disagreeable
to any other being too. How can I inflict upon another being what is displeasing
and disagreeable to myself? Having reflected repeatedly thus, then gradually:
1: He/she will carefully avoid all destruction of any life-form whatsoever...
2: He/she will persuade others also to abstain from all destruction of any life...
3: He/she will speak praising harmlessness and avoidance of all & any killing...
In exactly this way is this good bodily behaviour purified in three respects!!!

Source (edited extract):
The Grouped Sayings of the Buddha. Samyutta Nikāya. [V:353]
section 55: Sotāpattisamyutta. Thread 7: To the people at the Bamboo gate...

HARMLESSNESS AVOIDS THE ULTIMATE WRONG!
All sentient beings feel pain from violence.
All sentient beings fear death.
Seeing other beings are like oneself;
Treating other beings like oneself;
One should never ever harm nor kill ...
Dhammapada 129

Whoever harms the harmless & innocent beings,
upon such very fool, pain of evil promptly return
as dust thrown against the wind.
Dhammapada 125

Whoever injures, with weapon or stick, beings
searching for their happiness - when after death -
seeking same happiness, such fool never finds it!
Dhammapada 131
 
Whoever never injures, with weapon nor stick, beings
searching for their happiness - when after death -
seeking same happiness, such clever & kind one
always gain it!
Dhammapada 132

The Noble is not one who injures living beings.
The Noble is one who never injures living beings.
Dhammapada 270

Ever are the true disciples of the Buddha
well awake & quite aware. Constantly they
meditate both day & night on Harmlessness.
Dhammapada 300

The one who has left violence,
who never harm any being,
whether moving are stationary,
who never kill nor causes to kill,
such one, harmless, is a Holy One.
Dhammapada 405

The one who is friendly among the hostile,
who is harmless among the violent,
who is detached among the greedy,
such one is a Holy One.
Dhammapada 406

More on Harmlessness and non-violence (Ahimsa):
http://What-Buddha-Said.net/drops/II/Kamma_leading_to_short_&_long_life.htm
http://What-Buddha-Said.net/drops/II/Harmlessness_and_Tolerance.htm
http://What-Buddha-Said.net/drops/III/Optimal_Observance_I.htm
http://What-Buddha-Said.net/drops/IV/Threefold_Right_Action.htm

http://What-Buddha-Said.net/drops/What_is_Right_Action.htm
http://What-Buddha-Said.net/drops/III/The_Five_Basics.htm

http://What-Buddha-Said.net/drops/II/What_is_Virtue.htm
http://What-Buddha-Said.net/drops/Slaying_Anger.htm

 

Avoid all Killing!!!