TABARANI 6398:
from ʿAbdullāh b. Sufyān from his father —
[Machine] I said, "O Messenger of Allah, give me a saying in Islam that I do not need to ask anyone after you." He said, "Say, 'I believe in Allah' and then remain upright." I asked, "What should I fear, O Messenger of Allah?" he motioned towards his tongue.
الطبراني ٦٣٩٨:
عن عبد الله بن سفيان عن أبيه —
قُلْتُ يَا رَسُولَ اللهِ قُلْ لِي فِي الْإِسْلَامِ قَوْلًا لَا أَسْأَلُ أَحَدًا بَعْدَكَ؟ فَقَالَ قُلْ آمَنْتُ بِاللهِ ثُمَّ اسْتَقِمْ قُلْتُ مَا أَتَّقِي يَا رَسُولَ اللهِ؟ قَالَ «فَأَوْمَأَ إِلَى لِسَانِهِ»