14 For these reasons, We ordain that on the ninth, tenth and eleventh of thecoming month of June, in the principal church of every town and village, certain prayers besaid, and on each of these days there be added to the other prayers the Litanyof the Sacred Heart approved by Our authority. On the last day the form ofconsecration shall be recited which, Venerable Brethren, We sent to you withthese letters.
Source: Annum Sacrum (Vatican.va)