Revelation 15:3-4: And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints. Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest.

Exaltation-worthy saints in heaven on mount Zion at the start of the Third Woe will sing two songs with the harps of God mentioned in Revelation 15:2.¹ This heavenly choir is the same group of 144,000 Servants that stand with Christ on mount Zion in Revelation 14:1,² and that sing with harps in Revelation 14:2-3.³ They are members of the Church of the Firstborn,⁴ gathered at the Second Coming from one end of heaven and earth to the other.⁵ These elect persons sing the song of Moses the servant of God in praise for their deliverance.⁶ They separately sing the Song of the Lamb⁷ as a new and different song in a Second Coming context,⁸ but to the same effect.⁹ Only the redeemed saints on heavenly mount Zion¹⁰ can sing this new song at the Second Coming¹¹ because they alone have cause to celebrate their final triumph and redemption as exaltation-worthy saints.¹²

The song of the Lamb at the start of the Third Woe is a new song,¹³ but it is also the antitype for the ancient song of Moses.¹⁴ The ancient song of Moses was a song of deliverance¹⁵ that the Israelites sang after the armies of Pharoah were drown in the Red Sea.¹⁶ The exalted saints (144,000 Servants) on mount Zion will sing the song of Moses at the start of the Third Woe when Christ delivers¹⁷ them from the Second Beast, which is Modern Babylon,¹⁸ just as the Israelites praised Jehovah for their deliverance from Egypt.¹⁹

The lyrics to the song of the Lamb begin with the words: Great and marvellous are thy works.²⁰ John used the same words to describe the Grand Sign of the Son of Man in Revelation 15:1.²¹ This is to be expected since the Grand Sign and singing occur simultaneously at the start of the Third Woe.²²

The lyrics to the song of the Lamb understandably focus on Jesus Christ. The Lord God Almighty²³ refers to Christ.²⁴ King of saints is commonly translated as King of nations²⁵ and sometimes as King of the ages.²⁶ These names reflect Christ's right to rule and reign both politically and ecclesiastically at the Second Coming and throughout the millennium.²⁷ The lyrics also express that the ways of God are both just and true.²⁸ Christ is just in his destruction of the wicked,²⁹ as he is merciful in his redemption of the righteous.³⁰ Christ is holy and true³¹ in all his judgments.³²

People that remain on earth at the start of the Third Woe may have the ability to hear the saints in heaven when they sing the song of the Lamb.³³ The lyrics to the song include this question: Who shall not fear thee, O Lord, and glorify thy name?³⁴ Terrestrial survivors of the great earthquake at the end of the Second Woe would logically be among those that give glory to God³⁵ because in that earthquake God's judgments are made manifest.³⁶ Celestial-worthy people still on earth who are not exaltation-worthy may also be among those that will fear God and glorify his name more earnestly. These more righteous survivors³⁷ of the great earthquake will fear God³⁸ and recognize that the Lord Jesus Christ is holy.³⁹

Survivors of the Second Woe will also fear (reverence)⁴⁰ God when Christ's righteous judgments⁴¹ are made manifest during the Third Woe.⁴² The more righteous people⁴³ that survive the Third Woe shall come and worship.⁴⁴ These words anticipate the millennium, when all people will eventually come to God's holy mountain⁴⁵ (temple)⁴⁶ and worship before⁴⁷ Jesus Christ.⁴⁸ The survivors of the Third Woe will be those people that have lived at least a terrestrial law before the Second Coming.⁴⁹