Assalāmu ‘alaykum wa rahmatullāhi Wabarakath,
The Prophet Muhammad SAWs said:
I came across this beautiful dua [supplication] by Muhammad Al Luhaidan for Gaza and it brought tears to my eyes.
"The dua of a Muslim for his brother/Sister (in Islam) in his absence is readily accepted. An angel is appointed to his side. Whenever he makes a beneficial dua for his brother the appointed angel says, 'Aameen. And may you also be blessed with the same.'" [Sahih Muslim]