Ahimsa is one of the Yamas, or the 1st limb of the Yoga Sutras

Ahimsa is defined as not harming or non-violence. The concept behind this is to go back to a sense of love. Then to be in that space of love.
Definition taken via notation process during the 8 Limbs- The Yoga Sutras of Patanjali’s session during the Yoga Journal Conference.