BT RH 20a(19) :ב{כ}<ב>לאי מה טיבותא עבדינן בהדייהו‏ : do our Babylonian colleagues know what a favor we are doing for them?
See the entire entry for ṭaybū/ṭēḇū, ṭaybūṯā/ṭēḇūṯā n.f. kindness; Grace