It is narrated from Sayyiduna Ka'b bin 'Ujrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When any one of you performs ablution and performs it well, and then sets out with the intention of prayer, he should not intertwine his fingers with each other, because he is considered to be in prayer."
Hadith Takhrij«حديث حسن۔ أخرجه ابوداود: 562، والترمذي: 386 ، (انظر مسند أحمد ترقيم الرسالة: 18103 ترقیم بيت الأفكار الدولية: 18282»
Brief Explanation
Benefits: … Interlacing the fingers of one hand into the fingers of the other hand is called tashbik. This is prohibited at the time when a Muslim is going for prayer, or is sitting in wait for the prayer, or is performing the prayer.