Whom did the Rasool purify?

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Regarding the verse from the Holy Quran:

Certainly Allah conferred a favor on the Momineen when He sent among them a Rasool from among themselves, reciting to them His verses and purifying them, and teaching them the Book and the Wisdom, although before that they were in clear misguidance [3:164]

Imam Ali (as) said:

We (the Ahlul Bayt) are the ones among whom Allah (swt) sent the Rasool, reciting His (swt) verses to us (as), and purified us (as), and taught us (as) the Book and the Wisdom.

Reference: [Tawil al Ayat, 1/692, :2, :2]