Strong's #4687: mitsvah (pronounced mits-vaw')
 from 6680; a command, whether human or divine (collectively, the Law):--(which was) commanded(-ment), law, ordinance, precept.
Brown-Driver-Briggs Hebrew Lexicon:
 
  mitsvâh 
 
 1) commandment
 
 1a) commandment (of man)
 1b) the commandment (of God)
 1c) commandment (of code of wisdom)
 
  Part of Speech: noun feminine
Relation: from H6680
Usage:
This word is used 181 times:
Psalms 119:127: "Therefore I love  thy commandments above gold; yea, above fine gold."
Psalms 119:131: "and panted: for I longed  for thy commandments."
Psalms 119:143: "Trouble and anguish have taken hold on  me: yet thy commandments are my delights."
Psalms 119:151: "art near, O LORD; and all  thy commandments are truth."
Psalms 119:166: "I have hoped for thy salvation, and done  thy commandments."
Psalms 119:172: "of thy word: for all  thy commandments are righteousness."
Psalms 119:176: "for I do not forget  thy commandments."
Proverbs 2:1: "thou wilt receive my words, and hide  my commandments with"
Proverbs 3:1: "my law; but let thine heart keep  my commandments:"
Proverbs 4:4: "retain my words: keep  my commandments, and live."
Proverbs 6:20: "My son, keep thy father's  commandment, and forsake not the law of thy mother:"
Proverbs 6:23: "For  the commandment is a lamp; and the law is light; and reproofs of instruction are the way"
Proverbs 7:1: "keep my words, and lay up  my commandments with"
Proverbs 7:2: "Keep  my commandments, and live; and my law as the apple of thine eye."
Proverbs 10:8: "The wise in heart will receive  commandments: but a prating fool shall fall."
Proverbs 13:13: "shall be destroyed: but he that feareth  the commandment shall be rewarded."
Proverbs 19:16: "He that keepeth  the commandment keepeth his own soul; but he that despiseth his ways shall die."
Ecclesiastes 8:5: "Whoso keepeth  the commandment shall feel no evil thing: and a wise man's heart"
Ecclesiastes 12:13: "God, and keep  his commandments: for this is the whole duty of man."
Isaiah 29:13: "from me, and their fear toward me is taught  by the precept of men:"
Isaiah 36:21: "a word: for the king's  commandment was, saying, Answer him not."
Isaiah 48:18: "O that thou hadst hearkened  to my commandments! then had thy peace been as a river, and thy righteousness as the waves"
Jeremiah 32:11: "of the purchase, both that which was sealed  according to the law and custom, and that which was open:"
Jeremiah 35:14: "obey their father's  commandment: notwithstanding I have spoken unto you, rising early"
Jeremiah 35:16: "of Rechab have performed  the commandment of their father, which he commanded them; but this"
Jeremiah 35:18: "of Israel; Because ye have obeyed  the commandment of Jonadab your father,"
Jeremiah 35:18: "of Jonadab your father, and kept all  his precepts, and done according unto all"
Daniel 9:4: "and mercy to them that love him, and to them that keep  his commandments;"
Daniel 9:5: "and have done wickedly, and have rebelled, even by departing  from thy precepts and from thy judgments:"
Malachi 2:1: "And now, O ye priests, this  commandment is for"
Malachi 2:4: "I have sent this  commandment unto you, that my covenant might be with"