Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:11844a –
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السيوطي:١١٨٤٤a –

"المسألَةُ أنْ ترفع يديك حَذْوَ مَنكبَيكَ، والاسْتِغْفارُ (أَن تُشيرَ) بِأصْبُع وَاحِدَة، والابْتِهالُ أن تَمُدَّ يَدَيكَ جميعًا".  

[د] أبو داود [ض] ضياء المقدسي في مختاره عن ابن عباس

See similar narrations below:

Collected by Abū Dāwūd
abudawud:1489 – Mūsá b. Ismāʿīl > Wuhayb / Ibn Khālid > al-ʿAbbās b. ʿAbdullāh b. Maʿbad b. al-ʿAbbās b. ʿAbd al-Muṭṭalib > ʿIkrimah > Ibn ʿAbbās > al-Masʾalah > Tarfaʿ Yadayk Ḥadhw Mankibayk or > Umā And al-Āistighfār > Tushīr Biʾuṣbuʿ Wāḥidah Wa-al-Āibtihāl

Ikrimah quoted Ibn Abbas as saying: When asking for something you should raise your hands opposite to your shoulders; when asking for forgiveness you should point with one finger; and when making an earnest supplication you should spread out both your hands.  

أبو داود:١٤٨٩ – حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ حَدَّثَنَا وُهَيْبٌ يَعْنِي ابْنَ خَالِدٍ حَدَّثَنِي الْعَبَّاسُ بْنُ عَبْدِ اللَّهِ بْنِ مَعْبَدِ بْنِ الْعَبَّاسِ بْنِ عَبْدِ الْمُطَّلِبِ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ قَالَ الْمَسْأَلَةُ

أَنْ تَرْفَعَ يَدَيْكَ حَذْوَ مَنْكِبَيْكَ أَوْ نَحْوَهُمَا وَالاِسْتِغْفَارُ أَنْ تُشِيرَ بِأُصْبُعٍ وَاحِدَةٍ وَالاِبْتِهَالُ أَنْ تَمُدَّ يَدَيْكَ جَمِيعًا