Delete Records Not Matching Top25 In GroupBy

I have a table (tblA) that records the RecordID, UserID and
LastViewedDate (DateTime) of each record opened in tblB where RecordID
is the PK in tblB. I want to construct a query that groups all records
in tblA by RecordID, filters by UserID and keeps only the most recent
25 RecordIDs and deletes the rest.

This gets me a recordset of all RecordIDs filtered by UserID in tblA
but I can't figure out how to sort it by LastViewedDate DESC and to
eliminate those not in the Top25:

SELECT RecordID
FROM dbo.tblA
WHERE (UserID = 1234)
GROUP BY RecordID


Any help is appreciated!
lq