Allāhumma lā ṭayra illā ṭayruk,
wa lā khayra illā khayruk,
wa lā ilāha ghayruk.
O Allah there is no portent other than Your portent,
no goodness other than Your goodness,
and none worthy of worship other than You.
Reference:
Ahmad 2/220, Ibn As-Sunni (no. 292). See also Al-Albani,
Silsilatul-'Ahadlth As-Sahihah 3/54, (no. 1065). As for bodings of good,
these used to please the Prophet (ﷺ) and so when he heard good words from
someone, he used to say: "We have taken from you a good portent from your
mouth," Abu Dawud, Ahmad. See also Al-Albani, Silsilatul-'Ahadith
As-Sahihah 2/363, and it is with Abu Ash-Shaikh Al-Asfahani in
'Akhlaqun-Nabiyy, pg. 270.