Modern Hebrew, צ tsadhe presents a voiceless alveolar affricate. “Voiceless alveolar affricate is a type of affricate consonant pronounced with the tip or blade of the tongue against the alveolar ridge (gum line) just behind the teeth. This refers to a class of sounds, not a single sound.” 18th letter of the Hebrew alphabet. A person, who safeguards and protects his eyes from evil things and protects his mouth and speech from saying bad things, will be a tzadi, righteous individual. It came also to be used for the number 90. Righteous, hunt. What is the concept of a Rebbe? “Rebbe,” רבי, is an acronym for Rosh B’nei Yisrael, “the head of the Jewish people. “What is a head? The head of a body is its control center. It gives life, nourishment, and direction to the rest of the body. It also feels the pain, desires and needs of every aspect of its body. The numerical equivalent of the letter tzaddik is ninety. In Ethics of Our Fathers it says: “When one reaches the age of ninety, one is bent over (lashuach).” On a physical level, this means that at ninety, a man is infirm and bowed with weak­ness. On a spiritual plane, represents the concept of humility. One reaches ninety, he or she has become so spiritual and humble that they bend withover for God. He is no longer an inde­pendent character but an extension of God Himself.
It reads in Psalm 119:137-144 NIV, צ Tsadhe
You are righteous, Lord, and your laws are right. The statutes you have laid down are righteous; they are fully trustworthy. My zeal wears me out, for my enemies ignore your words. Your promises have been thoroughly tested, and your servant loves them. Though I am lowly and despised, I do not forget your precepts. Your righteousness is everlasting, and your law is true. Trouble and distress have come upon me, but your commands give me delight. Your statutes are always righteous; give me understanding that I may live.