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.
bukhari:3458Muḥammad b. Yūsuf > Sufyān > al-Aʿmash > Abū al-Ḍuḥá > Masrūq > ʿĀʾishah Kānat Takrah

That she used to hate that one should keep his hands on his flanks while praying. She said that the Jew used to do so.  

البخاري:٣٤٥٨حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ حَدَّثَنَا سُفْيَانُ عَنِ الأَعْمَشِ عَنْ أَبِي الضُّحَى عَنْ مَسْرُوقٍ

عَنْ عَائِشَةَ ؓ كَانَتْ تَكْرَهُ أَنْ يَجْعَلَ {الْمُصَلِّي} يَدَهُ فِي خَاصِرَتِهِ وَتَقُولُ إِنَّ الْيَهُودَ تَفْعَلُهُ  

تَابَعَهُ شُعْبَةُ عَنِ الأَعْمَشِ