Definition and Context:
Reviving concern refers to the renewed interest, care, or attention towards spiritual matters, often characterized by a return to fervent prayer, repentance, and a desire for holiness. This concept is deeply rooted in the biblical narrative, where God's people are frequently called to awaken from spiritual slumber and return to a vibrant relationship with Him.

Biblical Instances and Themes:

1. Old Testament Examples:
The Old Testament is replete with instances where God calls His people to revive their concern for His commandments and covenant. In 2 Chronicles 7:14, God promises, "if My people who are called by My name will humble themselves and pray and seek My face and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land." This verse underscores the importance of repentance and seeking God as a means of revival.

The prophets often served as catalysts for reviving concern among the Israelites. For example, the prophet Joel calls for a sacred assembly and fasting, urging the people to "return to the LORD your God, for He is gracious and compassionate, slow to anger and abounding in loving devotion" (Joel 2:13).

2. New Testament Insights:
In the New Testament, the theme of reviving concern is evident in the teachings of Jesus and the apostles. Jesus' parables often highlight the need for vigilance and readiness, as seen in the Parable of the Ten Virgins (Matthew 25:1-13), where the wise virgins are prepared for the bridegroom's arrival, symbolizing spiritual readiness and concern.

The early church experienced periods of revival, as seen in Acts 2, where the Holy Spirit's outpouring led to a renewed zeal and commitment among believers. The apostle Paul frequently exhorts believers to remain steadfast and vigilant in their faith. In Romans 13:11, he writes, "And do this, understanding the present time: The hour has already come for you to wake up from your slumber, because our salvation is nearer now than when we first believed."

3. The Role of the Holy Spirit:
The Holy Spirit plays a crucial role in reviving concern among believers. In John 16:8, Jesus explains that the Spirit will "convict the world concerning sin and righteousness and judgment." The Spirit's work in the hearts of individuals and communities often leads to a renewed awareness of God's holiness and a desire to align one's life with His will.

4. Practical Application:
Reviving concern is not merely an emotional experience but involves practical steps towards spiritual renewal. This includes regular prayer, engagement with Scripture, participation in communal worship, and acts of service. Hebrews 10:24-25 encourages believers to "consider how to spur one another on to love and good deeds, not neglecting to meet together, as is the habit of some, but encouraging one another."

5. Historical Revivals:
Throughout church history, there have been significant periods of revival where a widespread reviving concern for spiritual matters has transformed communities and nations. These revivals often begin with a small group of believers earnestly seeking God and are marked by deep repentance, powerful preaching, and a return to biblical truths.

Conclusion:
Reviving concern is a recurring theme in Scripture, emphasizing the need for believers to remain vigilant and responsive to God's call. It involves a heartfelt return to God, characterized by repentance, prayer, and a renewed commitment to living according to His Word.