Related Rule
Israel
Practice Relating to Rule 140. The Principle of Reciprocity
Israel’s Manual on the Laws of War (1998) states: “Mutuality is the cardinal basis for the existence of the laws of war. The breakdown of rules anywhere would lead to a deterioration in which each side would respond to the acts of the other.” 
Israel, Laws of War in the Battlefield, Manual, Military Advocate General Headquarters, Military School, 1998, p. 4.
Israel’s Manual on the Rules of Warfare (2006) states: “Mutuality lies at the foundation of the rules of warfare. Whenever the rules collapsed, deterioration set in, each side reacting to the actions of the other.” 
Israel, Rules of Warfare on the Battlefield, Military Advocate-General’s Corps Command, IDF School of Military Law, Second Edition, 2006, p. 8.
The Manual on the Rules of Warfare (2006) is a second edition of the Manual on the Laws of War (1998).