John Gill Commentary John 11:21

"Martha therefore said unto Jesus, Lord, if thou hadst been here, my brother had not died." — John 11:21 (ASV)

When said Martha unto Jesus
When she was come to him,

Lord, if you had been here my brother had not died :
which expresses much faith, but with a mixture of weakness, as if the presence of Christ was necessary for the working a cure; whereas he could as well have restored her brother to health absent, as present, had it been his will, as he did the centurion's servant, and the nobleman's son of Capernaum.