George Muller's Orphan House - Bristol

Again, in 1873, on the first day of the week of prayer, the Holy Spirit so moved that, without any unusual occasion for deep seriousness, hundreds were, during that season, hopefully converted. Constant prayer for their souls made the orphan homes a hallowed place, and by August 1st, it was believed, after careful investigation, that seven hundred and twenty-nine might be safely counted as being disciples of Christ, the number of believing orphans being thus far in excess of any previous period. A series of such blessings have, down to this date, crowned the sincere endeavours of all who have charge of these children, to lead them to seek first 'the kingdom of God and His righteousness.'

And: “George Muller of Bristol,” by Arthur T Pierson, 1899.