Heinrich Bullinger (1504–1575) on Christ's Expiation for the Sins of All Men

The Lord made to meet on him, as an expiatory sacrifice, not one or another or most sins of one or other man, but all the iniquities of all of us. Therefore I say, the sins of all men of the world of all ages have been expiated by his death.

Bullinger, Isaiah, p.266b, sermon 151; cited in G. Michael Thomas, The Extent of the Atonement: A dilemma for Reformed Theology from Calvin to the Consensus 1536–1675 (Paternoster, 1997), 75.

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Notes:

Zwingli has many similar statements (click).

Farel likewise said:

Jesus died as if He had done all that men and women have done and will do from the beginning to the end of the world, since all is put on Him.

Guillaume Farel, quoted in Henri Heyer, Guillaume Farel: An Introduction to His Theology, trans. B. Reynolds (Texts and Studies in Religion 54; Lewiston, NY: The Edwin Mellen Press, 1990), 90.