Al-Kāfi - Volume 4 > Disciplines to Maintain in the State of al-’Ihram
Hadith #5

5ـ مُحَمَّدُ بْنُ يَحْيَى وَأَحْمَدُ بْنُ إِدْرِيسَ عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ أَحْمَدَ بْنِ الْحَسَنِ عَنْ عَمْرِو بْنِ سَعِيدٍ عَنْ مُصَدِّقِ بْنِ صَدَقَةَ عَنْ عَمَّارِ بْنِ مُوسَى عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ سَأَلْتُهُ عَنِ الْمُحْرِمِ يَتَخَلَّلُ قَالَ لا بَأْسَ.

5. Muhammad ibn Yahya and Ahmad ibn Idris has narrated from Muhammad ibn Ahmad from Ahmad ibn al-Hassan from ’Amr ibn Sa‘id from Musaddiq ibn Sadaqah from ‘Ammar ibn Musa who has said the following: “I once asked abu ‘Abd Allah, ‘Alayhi al-Salam, about a man who uses a toothpick while he is in the state of Ihram. He (the Imam) said, ‘It is not harmful.’”