Biblical Reference:
The phrase "Blessed is He who comes in the name of the Lord" is a significant biblical expression found in both the Old and New Testaments. It is prominently featured in the Psalms and the Gospels, serving as a prophetic and messianic declaration.

Old Testament Context:
The origin of this phrase is found in Psalm 118:26 : "Blessed is he who comes in the name of the LORD. From the house of the LORD we bless you." Psalm 118 is part of the Hallel, a collection of psalms (113-118) traditionally sung during Jewish festivals, including Passover. This psalm is a song of thanksgiving and deliverance, celebrating God's steadfast love and salvation. The phrase is a blessing pronounced upon those who enter the temple to worship, acknowledging their coming in the authority and purpose of Yahweh.

New Testament Fulfillment:
In the New Testament, this phrase takes on a messianic fulfillment, particularly in the context of Jesus Christ's triumphal entry into Jerusalem. In Matthew 21:9 , the crowds shout, "Hosanna to the Son of David! Blessed is He who comes in the name of the Lord! Hosanna in the highest!" This event, known as Palm Sunday, marks Jesus' public acknowledgment as the Messiah by the people, who recognize Him as the one sent by God to bring salvation.

The phrase is also echoed in Matthew 23:39 , where Jesus laments over Jerusalem, saying, "For I tell you, you will not see Me again until you say, 'Blessed is He who comes in the name of the Lord.'" Here, Jesus prophesies His second coming, indicating that the recognition of His messianic role will be essential for His return.

Theological Significance:
The declaration "Blessed is He who comes in the name of the Lord" holds deep theological significance. It affirms the identity of Jesus as the Messiah, the anointed one sent by God to fulfill the promises of the Old Testament. This phrase encapsulates the hope and expectation of the Jewish people for deliverance and salvation, which Christians believe is fulfilled in Jesus Christ.

The use of this phrase during Jesus' triumphal entry signifies the acknowledgment of His divine mission and authority. It also highlights the tension between the people's expectations of a political liberator and the spiritual salvation Jesus came to provide. The phrase serves as a reminder of the ultimate recognition and acceptance of Jesus' messianic role, which will be fully realized at His second coming.

Liturgical Use:
In Christian liturgy, "Blessed is He who comes in the name of the Lord" is often recited or sung during the celebration of the Eucharist, particularly in the Sanctus, as a proclamation of Christ's presence and the anticipation of His return. This liturgical use connects the worship of the church with the biblical narrative, affirming the continuity of God's redemptive plan through Jesus Christ.

Conclusion:
The phrase "Blessed is He who comes in the name of the Lord" is a profound expression of faith, hope, and recognition of Jesus Christ's messianic mission. It bridges the Old and New Testaments, encapsulating the fulfillment of God's promises and the anticipation of Christ's return.