The chossid Reb Avrohom Pariz was in charge of the pidyon shvuyim fund in Lubavitch. One day in Elul, the Rebbe Rashab sent him on a mission to Vitebsk, and requested that while there he should buy a Tehillim for him. The Rebbe then added with a smile, “Now is the season for it.”
We have a tradition from the Baal Shem Tov, who heard it from his Rebbe, Achiya HaShiloni, that each day of Elul and Aseres Yemei Teshuvah we should recite three kapitlach of Tehillim, concluding the sefer on Yom Kippur.
(שמועות וסיפורים ח"א ע' 145, היום יום א' אלול)
During this month, it is the custom of anshei mayseh to check their tefillin and mezuzos and any other mitzva that needs attention. The Rebbe urged that this directive be widely publicized.
(מט"א סי' תקפ"א, סה"ש תשמ"ח ח"ב ע' 610)
During the month of Elul and Aseres Yemei Teshuva we bentch one another with berachos for a kesiva vachasima tova and leshana tova umesuka. This exchange of berachos, which should be done both in speech and in writing, increases the berachos that HaShem bestows upon Yidden.
(אוצר מנהגי חב"ד ע' ט)
