As a Particular Baptist, Spurgeon subscribed to the 1689 2nd London Baptist Confession of Faith which he even reprinted in 1855 during his second year at New Park Street Chapel.
He had this to say about it:
This ancient document is the most excellent epitome of the things most surely believed among us. It is not issued as an authoritative rule or code of faith, whereby you may be fettered, but as a means of edification in righteousness. It is an excellent, though not inspired, expression of the teaching of those Holy Scriptures by which all confessions are to be measured. We hold to the humbling truths of God’s sovereign grace in the salvation of lost sinners. Salvation is through Christ alone and by faith alone.”
This Confession along with many others has been reprinted in the new Reformed Confessions of the 16th and 17th Centuries in English translation set by Reformation Heritage Books
The 1689 Baptist Confession along with a few other Baptist documents can be found in volume 4 of the set.
This week WTS Books has the 4 vol. set on sale for $100 and each volume for $30.
P.S. If you’d like a detailed look at what is included in each volume see my post at The Old Guys.