Charles Ellicott Commentary Isaiah 66:11

"that ye may suck and be satisfied with the breasts of her consolations; that ye may milk out, and be delighted with the abundance of her glory." — Isaiah 66:11 (ASV)

That you may suck ... —The figure takes a new and bolder form. The friends who visit the rejoicing mother are invited to take their place with the new-born child, and to share his nurture. The underlying thought is, of course, that the heathen nations who had been friendly to Zion were to become converts, and be incorporated with her citizens.