Musar su Salmi 20:10

Continuing the allegory, Jacob, "concealed" the letter ע in his name when he crossed the river יבק, (which is יעקב minus the letter ע), as reported in 32, 23: ויעבר את מעבר יבק. The Kabbalists say that the remaining letters of his name, i.e. י-ב-ק stand for יעננו ביום קראנו, "May He respond to us on the day we call upon Him." The letter ע is "swallowed up," concealed in the word יעננו. Since the letter ע, when following the letter י, is practically not heard, it supplements the word יבק as if the former had been spelled יעקב. The expression יעננו ביום קראנו can then be perceived as a call by Jacob. I have elaborated elsewhere on the numerical value of the word ויעבור being equivalent to the Ineffable Four-Lettered Name being spelled in words i.e. 72 + 216, both permutations of the name of G–d.

Our Sages instituted that we recite three times a day the verse, “And He, the merciful One atones iniquity, and does not destroy; He frequently withdraws His anger, and does not arouse all His rage” (Tehillim 78:38). It is said once in the prayer “Acknowledge Hashem, call upon His name,” once in “And a redeemer will come to Tzion,” and once at the beginning of the evening service. The reason for this is as follows: In this verse there are thirteen words, corresponding to the thirteen Divine attributes of mercy and three times thirteen is thirty-nine. Now, each day the evil impulse overwhelms a person so that it is only with the greatest difficulty that he is able to avoid committing sins carrying the penalty of thirty-nine lashes. Thus the recitation of this verse is a way of requesting the Holy One Blessed is He to grant atonement for the person’s sin as if he had actually received the lashes, in order that he will not be destroyed on account of it. For iniquity provokes the destructive forces called “anger” and “wrath.” It was these that brought indictments against Israel continually while they were in Egypt so that the Holy One Blessed is He, through His graciousness and compassion only revealed Himself to save them in the merit of the three Patriarchs. When He did reveal Himself it was in the form of the three Divine names: E-H-Y-H (“I will be”), Y-H-V-H (Tetragrammaton) and A-D-N-Y (“Lord”). The sum of the numerical values of these names is 112, which is equal to that of the acronym YB”K, the initial letters of the words, Ya’aneinu be’yom kareinu — “He will answer us on the day that we call out” (Tikkunei Zohar Chadash 130a). For this reason after we recite the verse, “And He is merciful, etc.,” we then recite the verse, “Hashem will save; the King will answer us on the day that we call out” (Tehillim 20:10).