James M. Gray 
Christian Workers’ Commentary on the Old and New Testaments [PDF ebook] 
Arranged in Sections with Questions for Use at Family Altars and in Adult Bible Classes. Containing Homiletic and Expository Suggestions for Young Preachers. Also an Index of Texts and Themes Receiving Special Treatment.

‘Whoever attempts it will find it far easier to write a long commentary than a brief one, ‘ said a famous commentator. This we believe. The Christian Workers’ Commentary represents the labor of eight years in the use of such spare hours as could be found in an otherwise well-filled life, but had the plan permitted its expansion into a series of volumes instead of one, it might have been completed earlier.

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