"Now, it happened in the fifth year of Jehoiakim the son of Josiah, king of Judah, in the ninth month, that all the people in Jerusalem and all the people who came from the cities of Judah to Jerusalem, proclaimed a fast before God". (Jeremiah [Hebrew]: 36/9 The Eastern Orthodox Bible (EOB))
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"And when they were sick, I dressed myself in sackcloth, humbled my soul with fasting, and prayed with my head bowed to my breast". (Ps:36/13 35 MT = 34 LXX)
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"I proclaimed there a fast, at the river Aue, that we should humble ourselves before our God, to seek of Him a straight way for us and for our children and for all our property". (Ezra: 8/21)
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"The men of Nineve believed God and proclaimed a fast and put on sackcloths, from the greatest of them to the least of them". (Jonah: 3/5.)
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"When Jesus entered into the house, His disciples asked Him privately, "Why could we not we cast it out?"
He told them, "This kind can come out by nothing, except by prayer and fasting1"."
(Mark: 9/28-29.)
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"Jesus said to them, "Can the friends of the bridegroom mourn, as long as the bridegroom is with them? The days will come when the bridegroom will be taken away from them, and then, they will fast". (Matt: 9/15; Mark: 2/20; Luke: 5/35)
About fasting and almsgiving
Selections from the Word of God2 on this topic