36550, For the Strength of Youth, Tithes and Offerings, 34
"Bring ye all the tithes into the storehouse, ... and prove me now herewith, saith the Lord of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it" (Malachi 3:10; 3 Nephi 24:10).
The law of tithing is an important commandment that you should obey throughout your life. A tithe is one-tenth of your income.
Paying tithing shows your gratitude for all that God has given you. It is a way to help build God's kingdom on earth. Tithing is used to build temples and meetinghouses, translate and publish the scriptures, provide Church materials to members, do missionary work, perform temple and family history work, and support seminaries and institutes.
Your attitude is important in paying tithing. Pay it because you love the Lord and have faith in Him. Pay it willingly with a thankful heart. Pay it first, even when you think you don't have enough money to meet your other needs. Doing so will help you overcome selfishness and be more receptive to the Spirit.
At the end of each year, schedule a time for tithing settlement with your bishop. This is a meeting in which you review your contribution records and declare whether you have paid a full tithe.
Obey the law of the fast by fasting once each month (if health permits), usually on the first Sunday of the month. A proper fast day observance includes not eating or drinking for two consecutive meals and giving a generous fast offering to help care for those in need. Begin and end your fast with prayer, asking for special help with a specific need.