In honor of Chai Elul, birthdays of the Baal Shem Tov and Alter Rebbe, the Rebbe blesses that new vitality enter Elul—growing in Torah, prayer, charity, good deeds, and teshuvah, all hinted in “Elul.” He concludes with wishes for a good, sweet year and notes on sefarim and a requested transcript.
https://www.torahrecordings.com/rebbe/igroskodesh/015/013/5743