Is sda3 formatted? If it already is, you can still move your home into it and start using it. If it is not, you can use mkfs.xfs on it to format it:
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sudo mkfs.xfs /dev/sda3
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/dev/sda3 /home xfs defaults 1 2
Then go into init 3, it's safer that way:
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sudo init 3
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sudo su
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mkdir /temp-home
mount /dev/sda3 /temp-home
mv /home/* /temp-home
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umount /temp-home
rmdir /temp-home
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mount /dev/sda3