Midrasch zu Schemuel I 9:21

Another interpretation (of Gen. 30:24): MAY THE LORD ADD (yosef) [ANOTHER SON FOR ME. Resh Laqish said:] The addition of the Holy One is greater than the original < gift >.⁶⁵Above, 5:10; see Gen. R. 61:4. From whom do you learn this? From Hezekiah, whose reign was fourteen years; but, when the Holy One made an addition for him, he added fifteen years. Thus it is stated (in II Kings 20:6): AND I WILL ADD FIFTEEN YEARS TO YOUR LIFE. Ergo, the addition is greater than the original. And so you find in the case of Benjamin, when his mother said to him (in Gen. 30:24): MAY THE LORD ADD (yosef) ANOTHER SON FOR ME, the Holy One also added for her ten tribes from him and two tribes from Joseph.⁶⁶Thus the addition (Benjamin) was five times greater than the original (Joseph). Gen. R. 61:4 cites the list of Benjamin’s ten sons in Gen. 46:21. R. Samuel bar Nahman said: The Holy One raised up twelve tribes from Rachel, ten from Benjamin and two from Joseph. And where is it shown that < the ten > were sons of Benjamin? Where it is written (in I Sam. 9:21): THEN SAUL ANSWERED AND SAID: AM I NOT A BENJAMINITE, FROM THE SMALLEST OF THE TRIBES OF ISRAEL, [AND MY CLAN THE SMALLEST OF THE CLANS OF THE TRIBES OF BENJAMIN]? And another verse says (in Jud. 20:12): AND {SAUL} [THE TRIBES OF ISRAEL] SENT [PEOPLE] AMONG ALL THE TRIBES OF BENJAMIN, SAYING. When the prophets saw that the addition was greater than the original, they began to bless Israel with the addition (rt.: YSP). Moses our Master said (in Deut. 1:11): MAY THE LORD GOD OF YOUR ANCESTORS ADD (rt.: YSP) TO YOUR NUMBERS < A THOUSAND TIMES > MORE THAN YOU ARE. David also said (in Ps. 115:14): MAY THE LORD ADD (rt.: YSP) TO YOUR NUMBERS, YOURS AND YOUR CHILDREN'S ALSO. In the world to come as well the Holy One will gather the exiles of Israel by means of this word (with the Hebrew root YSP). Thus it is stated (in Is. 11:11): AND IT SHALL COME TO PASS IN THAT DAY, THE LORD WILL EXTEND (rt.: YSP) HIS HAND A SECOND TIME TO PROCURE THE REST OF HIS PEOPLE.