As I Heard Them, Vol. 1, pp. 255-256, no. 94
The note that they found [ see below ], printed in Kuntres Yud-Beis Tammuz, 5708, after the Rebbe’s arrest, was kept by R. Pinchas, the son of R. Eliyahu Chaim [Althoiz], in Leningrad. Every Yud-Beis Tammuz they would make a farbrengen in his home and he would take the note from a hiding place, as well as two letters that the Rebbe had written on Yud-Beis Tammuz; one was a general letter, the other written personally to R. Eliyahu Chaim — and they would read them.
And this is the note that was found on the high ta-ble in the Rebbe’s room after his arrest on Wednesday, the 15th of Sivan, 5687 (1927), in Leningrad:
“Listen, chassidim and all Yidden who yearn for Moshiach; give over in my name to all chassidim in the world: I have instructed that in every chassidishe shul — after the daily morning prayers, including Shabbos — everyone should recite with a minyan the portion of Tehillim as they are divided into the days of the month, and afterwards recite Kaddish; and all the local shopkeepers and businessmen should come to shul to daven and for the class in Ein Yaakov, and Hashem will help them with abundant livelihood.
“Chassidim: you should say that I instruct you — and for other Yidden, say that for Ahavas Yisroel and for the well-being of Yidden, I beg them — to fulfill this; and Hashem will help them with a year of good fortune in ruchnius and gashmius, and we will merit the complete Redemption through Moshiach, Amen.”