Reference for Bava Metzia 172:15
ופליגא דר' חמא בר' חנינא דאמר ר' חמא בר' חנינא וכן תנא דבי רבי ישמעאל בשכר שלשה זכו לשלשה בשכר חמאה וחלב זכו למן בשכר והוא עומד עליהם זכו לעמוד הענן בשכר יוקח נא מעט מים זכו לבארה של מרים
But he is thus in conflict with R. Hama son of R. Hanina. For R. Hama son of R. Hanina said, and the School of Ishmael taught likewise: As a reward for three things [done by Abraham] they [his descendants] obtained three things. Thus: As a reward for, [and he took] butter and milk, they received the manna; as a reward for, And he stood by them, they received the pillar of cloud;<span class="x" onmousemove="('comment',' [H], lit., 'the standing (column) of cloud.' ');"><sup>26</sup></span> as a reward for, Let a little water, I pray you, be fetched, they were granted Miriam's well.<span class="x" onmousemove="('comment',' Miriam's well corresponds to the verse quoted above: and thou shalt smite the rock, etc. The dispute is in respect of 'and he stood by them': according to Rab, his reward was the promise contained in 'behold, I will stand before thee there by the rock'; whereas in R. Hama b. R. Hanina's opinion, it was the 'pillar of cloud'. [This is an illustration of the principle 'measure for measure', which is God's guiding rule for reward and punishment.] ');"><sup>27</sup></span>