The Prophet ﷺ said: The supplication which gets the quickest answer is that made by one distant Muslim for another. (Using translation from Abū Dāʾūd 1535)
سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «إِنَّ أَسْرَعَ الدُّعَاءِ إِجَابَةُ دَعْوَةِ غَائِبٍ لِغَائِبٍ»