이사야 12:6 미드라쉬: Shir HaShirim Rabbah & Midrash Tehillim

“Let us exult and rejoice in you.” Ten expressions of joy are employed in Israel’s regard: Gila, sisa, simḥa, rina, pitzḥa, tzahala, alatza, elza, ḥedva, terua. Gila, “rejoice [gili] greatly, daughter of Zion” (Zechariah 9:9); sisa, “I will be gladdened [sos asis] in the Lord” (Isaiah 61:10); simḥa, “rejoice [simḥu] with Jerusalem” (Isaiah 66:10); rina, “sing [roni] and rejoice, daughter of Zion” (Zechariah 2:14); pitzḥa, “burst [pitzḥi] into song and rejoice” (Isaiah 54:1); tzahala, “shout [tzahali] and sing” (Isaiah 12:6); alatza, “my heart rejoices [alatz] in the Lord” (I Samuel 2:1); elza, “my heart exults [vaya’aloz], and with my song I give thanks to Him” (Psalms 28:7); ḥedva, “the children of Israel…performed [the dedication of this House of God with joy [beḥedva]]” (Ezra 6:16); terua, “shout with joy [hariu] to the Lord, all the earth” (Psalms 98:4), “shout [hariu] to God with a joyous voice” (Psalms 47:2). There are some who remove terua and insert ditza, just as you say: “Anguish rejoices [tadutz] before it” (Job 41:14); it dances like that mudfish.

Another interpretation: "These are the servants of the Lord." These refer to the people of Israel, as it is said, "For they are My servants, the children of Israel" (Leviticus 25:55), and likewise it says, "Sing and rejoice, O daughter of Zion" (Isaiah 12:6). Another interpretation: "Hallelujah." Why doesn't it say "Praise the Lord"? Rabbi Yirmiyah said in the name of Rabbi Elazar, "This world is not worthy to praise the Lord in His entirety, but only in part, as it is said, 'Let every soul praise the Lord' (Psalm 150:6). Therefore, it says 'Hallelujah.' From here we learn that Hallel must have at least three verses, as it says, 'Hallelujah, praise God' (Psalm 146:1), which has two verses, and 'Hallelujah, praise God in His sanctuary' (Psalm 150:1), which has three verses. And one who says only one verse, it is as if he did not say Hallel at all. And similarly, it says, 'For I will proclaim the name of the Lord; ascribe greatness to our God' (Deuteronomy 32:3), which has one verse, and 'Sing to the Lord a new song' (Psalm 96:1), which has three verses. Therefore, it says 'Hallelujah.' Where do we learn that there were Hallel songs when Israel descended to Egypt, and there were 71 with the Divine Presence among them, as it says, "I will go down with thee into Egypt" (Genesis 46:4)? And it is written, "Thy fathers went down into Egypt with seventy persons" (Deuteronomy 10:22). And when the Holy One, blessed be He, ascended with them, it says, "I will also surely bring thee up again" (Genesis 46:4). Therefore, it says 'Hallelujah' for the number of 'Hallelujah.'