Hadith 4:314
Waki' narrated to us, from Isra'il, from Jabir, from 'Amir, who said: There is no harm in chewing gum for the fasting person, as long as he does not swallow his saliva.
حدثنا وكيع عن إسرائيل عن جابر عن عامر قال لا بأس بالعلك للصائم ما لم يبلغ ( ( ( يبلع ) ) ) ريقه