Which thou hast commanded by the hand of thy servants the prophets, saying: The land which you go to possess, is an unclean land, according to the uncleanness of the people, and of other lands, with their abominations, who have filled it from mouth to mouth with their filth.
Ezra 9:9 For we are bondmen, and in our bondage our God hath not forsaken us, but hath extended mercy upon us before the king of the Persians, to give us life, and to set up the house of our God, and to rebuild the desolations thereof, and to give us a fence in Juda and Jerusalem.
Ezra 9:10 And now, O our God, what shall we say after this? for we have forsaken thy commandments,
Ezra 9:11 Which thou hast commanded by the hand of thy servants the prophets, saying: The land which you go to possess, is an unclean land, according to the uncleanness of the people, and of other lands, with their abominations, who have filled it from mouth to mouth with their filth.
Ezra 9:12 Now therefore give not your daughters to their sons, and take not their daughters for your sons, and seek not their peace, nor their prosperity for ever: that you may be strengthened, and may eat the good things of the land, and may have your children your heirs for ever.
Ezra 9:13 And after all that is come upon us, for our most wicked deeds, and our great sin, seeing that thou our God hast saved us from our iniquity, and hast given us a deliverance as at this day,
The verse centers on "thou", "hast", "commanded", "hand", "servants", "prophets", "saying", and "land". It is saying that the verse draws attention to "thou" and "hast", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "And now O our God what shall..." into verse 12's "Now therefore give not your daughters to...", so "thou" and "hast" belong inside that flow. In Ezra context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "thou" and "hast" with trust shaped by these words, not by a vague optimism outside the passage.