I would like to present you another example of text’s alteration from shias.

First of all here text from english translation of book al-Kafi from al-shia.org:

H 168, Ch. 19, h 13
Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa ibn ‘Ubayd from Yunus ibn ‘Abd al-Rahman from Sum‘a ibn Mihran who has said the following.
“I said to (Imam) abu al-Hassan (a.s.), ‘May Allah keep you well, in our meetings we discuss the issues and find out that for almost every thing there is something in writing with us and that is all because of the blessings of your existence among us. We only find few small things for which we do not find any thing in writing we look on each other and we find certain issues similar to it then we use analogy in its best form.” The Imam said, “What do you have to do with analogy? Many people before have been destroyed because of analogy.” The Imam then said, “When you face an issue and know he rule about it deal with accordingly and if you would have no knowledge about its rule then this. He pointed to his own mouth, meaning thereby; this will give you the answer.” The Imam then said, “May Allah…? Abu Hanifah who used to say, “Ali said so and so, therefore, I said so and so. The Sahabah said so and so, therefore, I said so and so.” The Imam then asked me, “Have you been sitting with him?” I then relied, “No, I have not sat with him but such are his statements.” I then said to the Imam (a.s.). “May Allah keep you well, did the holy Prophet bring in his everything that people needed?” The Imam said, “Yes, and all that they will need up to the Day of Judgment.” I then said, “Is any thing lost from it?” The Imam replied, “No, it all is with the people to who they belong.’”

13 – علي بن إبراهيم، عن محمد بن عيسى بن عبيد، عن يونس بن عبدالرحمن، عن سماعة بن مهران، عن أبي الحسن موسى (عليه السلام) قال: قلت: أصلحك الله إنا نجتمع فنتذاكر ما عندنا فلا يرد علينا شئ إلا وعندنا فيه شئ مسطر (1) وذلك مما أنعم الله به علينا بكم، ثم يرد علينا الشئ الصغير ليس عندنا فيه شئ فينظر بعضنا إلى بعض، وعندنا ما يشبهه فنقيس على أحسنه؟ فقال: ومالكم وللقياس؟ إنما هلك من هلك من قبلكم بالقياس، ثم قال: إذا جاء كم ما تعلمون، فقولوا به وإن جائكم ما لا تعلمون فها – وأهوى بيده إلى فيه – ثم قال: لعن الله أبا حنيفة كان يقول: قال علي وقلت أنا، وقالت الصحابة وقلت، ثم قال: أكنت تجلس إليه؟ فقلت: لا ولكن هذا كلامه، فقلت:أصلحك الله أتى رسول الله (صلى الله عليه وآله) الناس بما يكتفون به في عهده؟ قال: نعم وما يحتاجون إليه إلى يوم القيامة، فقلت: فضاع من ذلك شئ؟ فقال: لا هو عند أهله.

Here what should be in complete text of report: