Elijah midi files – free to use – are here: http://www.learnchoralmusic.co.uk/Mendelssohn/Elijah/elijah.html and here: http://www.cyberbass.com/Major_Works/Mendelssohn_F/mendelssohn_elijah.htm I like this one – lets you speed it up or slow it down as well as having your part emphasised.
There are probably loads more out there – take your pick, but learn the notes for your part as soon as possible please 😲
If you use an Apple device (Mac, iphone and so on) you may need to download an App. to let you listen to Midi files, if you haven’t already.