The Blessed Buddha once said:
Pānam na hane na ca ghātayeyya,
na cānujaññā hanatam paresam,
sabbesu bhūtesu nidhāya dandam.
Ye thāvarā ye ca tasā santi loke.
One should not kill any living being,
nor cause it to be killed,
nor should one incite any other to kill.
Do never injure any being, whether strong
or weak, in this entire universe!
Sutta Nipāta 2.396

About
Harmlessness (Ahimsā):
Harmlessness_and_Tolerance,
Patient_is_Tolerance,
Not_Killing,
Bon_Benevolence,
Kamma_leading_to_short_&_long_life,
Blessing_all_Beings_by_Bliss,
May_all_be_Happy,
Optimal_Observance_I

ViDeO: Back-2-Basics #1 = Never
Kill!
Standard Quality:
http://youtu.be/6HFqhHKCtqc
High Definition:
https://vimeo.com/53853543