Allāhumma ḥawālaynā wa lā `alaynā.
Allāhumma `ala ‘l-ākāmi waẓ-ẓirāb,
wa buṭūni ‘l-awdiyati, wa manābitish-shajar.
O Allah, let the rain fall around us and not upon us,
O Allah, (let it fall) on the pastures, hills, valleys, and the roots of trees.
Reference:
Al-Bukhari 1/224, Muslim 1/614