John Gill Commentary John 20:18

"Mary Magdalene cometh and telleth the disciples, I have seen the Lord; and [that] he had said these things unto her." — John 20:18 (ASV)

Mary Magdalene came
Directly and immediately, being ready and willing to obey the commends of her Lord, with the utmost cheerfulness; and glad to go on such an errand, and carry such news to his disciples, even though her private interest and personal affection might have inclined her to desire to stay with Christ:

and told the disciples that she had seen the Lord ;
not only that he was risen from the dead, and she had been told so by the angels, but she had seen him herself, and was an eyewitness of his resurrection, and which she firmly believed; this she said, not only with all the marks of pleasure, joy and transport, but with an air of assurance and confidence:

and that he had spoken these things to her ;
as that he called them brethren, and bid her go to them, and acquaint them, that as he was risen, he should in a short time ascend to his Father and theirs, to his God and theirs; all which she faithfully related to them.