故旧不弃
词典danci.911cha.com
词典old friends are not to be neglected：故旧不弃。
1. danci.911chaxun.com
1. 故旧无大过，则不弃也。无求备于一人。 He does not look for one man to bear the full blame.
2. 故旧不弃。 Old friends are not to be neglected.