I've just started reading A Call to Spiritual Reformation by D.A. Carson about prayer. This hymn was on this morning and it matches well with what Carson is saying about prayer.
Brethren, We Have Come to Worship
Brethren, we have met to worship and adore the Lord our God;
Will you pray with all your power, while we try to preach the Word?
All is vain unless the Spirit of the Holy One comes down;
Brethren, pray, and holy manna will be showered all around.
Brethren, see poor sinners round you slumbering on the brink of woe;
Death is coming, hell is moving, can you bear to let them go?
See our fathers and our mothers, and our children sinking down;
Brethren, pray and holy manna will be showered all around.
Sisters, will you join and help us? Moses’ sister aided him;
Will you help the trembling mourners who are struggling hard with sin?
Tell them all about the Savior, tell them that He will be found;
Sisters, pray, and holy manna will be showered all around.
Is there here a trembling jailer, seeking grace, and filled with tears?
Is there here a weeping Mary, pouring forth a flood of tears?
Brethren, join your cries to help them; sisters, let your prayers abound;
Pray, Oh pray that holy manna may be scattered all around.
Let us love our God supremely, let us love each other, too;
Let us love and pray for sinners, till our God makes all things new.
Then He’ll call us home to Heaven, at His table we’ll sit down;
Christ will gird Himself and serve us with sweet manna all around.
A few versions:
This one takes me back! Remember how low the bass can go?
This hymn is apparently very popular and well-known. There are lots of versions on youtube, unlike some of the other hymns I've posted.