Awake, awake; put on thy strength, O Zion; put on thy beautiful garments, O Jerusalem, the holy city: for henceforth there shall no more come into thee the uncircumcised and the unclean.
Zion, long in bondage (Isaiah 51:17-20), is called to put on beautiful garments appropriate to its future properity.
Awake! Awake! put on thy strength, O Zion - as thy adornment: answering to put on thy beautiful garments in the parallel clauses. Arouse thyself from dejection and assume confidence.
The holy city - (Nehemiah 11:1; Revelation 21:2).
There shall no more come into thee ... the unclean - (Isaiah 35:8; Isaiah 60:21; Joel 3:17; Proverbs 21:27.) A prophecy never yet fulfilled.
The uncircumcised - spiritually (Ezekiel 44:9; Acts 7:51).