(At the Fast Day, 7 October 1857, Spurgeon preached to the largest crowd ever – 23,654 people – at The Crystal Palace in London.)

Spurgeon later commented about an incidnet which happened, at first unknown to him, while Spurgeon was there testing the acoustics and arranging the platform for his coming service there.

"In 1857, a day or two before preaching at the Crystal Palace, I went to decide where the platform should be fixed; and, in order to test the acoustic properties of the building, cried in a loud voice, "Behold the Lamb of God, which taketh away the sin of the world."

In one of the galleries, a workman, who knew nothing of what was being done, heard the words, and they came like a message from heaven to his soul. He was smitten with conviction on account of sin, put down his tools, went home, and there, after a season of spiritual struggling, found peace and life by beholding the Lamb of God. Some years after, he told this story to one who visited him on his death-bed.