A.T. Robertson Commentary Hebrews 10:37

"For yet a very little while, He that cometh shall come, and shall not tarry." — Hebrews 10:37 (ASV)

A very little while (μικρον οσον οσον). From Isa 26:20 as an introduction to the quotation from Hab 2:3f.

He that cometh (ο ερχομενος). The article ο is added to ερχομενος in Hab 2:3 and is given here a Messianic application.