When water is being fatched for the Shraddha, the powerful god Varuna should be lauded. After this, both Agni and Soma should be invoked with respect and pleased (with libations), O sinless one.
उदकानयने चैव स्तोतव्यो वरुणो विभुः। ततोऽग्निश्चैव सोमश्च आप्याय्याविह तेऽनघ॥